Coughing Up Blood (Hemoptysis): Causes, Red Flags & Treatment

## Overview Coughing up blood — medically known as **hemoptysis** (ICD-10: R04.2) — refers to the expectoration of blood or blood-tinged sputum originating from the lower respiratory tract (lungs, bronchi, or trachea). It is distinct from hematemesis (vomiting blood from the gastrointestinal tract) and from blood originating in the nasopharynx, although distinguishing these sources can sometimes be challenging for patients. Hemoptysis ranges from mild blood-streaking of sputum to life-threatening massive hemorrhage. The condition accounts for approximately 6.8% of outpatient pulmonary clinic visits and roughly 11% of pulmonary-related hospital admissions [1]. In population-based studies, the annual incidence of hemoptysis presenting to medical care is estimated at 1–4 per 1,000 adults, though mild, self-limited episodes are likely under-reported [2]. People commonly search for this symptom because it is understandably alarming. Even a small amount of blood in the sputum can provoke significant anxiety, particularly around the possibility of lung cancer or tuberculosis. While many cases have benign, self-limited causes — such as acute bronchitis — hemoptysis always warrants a thorough medical evaluation to exclude serious underlying pathology. **This article is for informational purposes only and does not replace professional medical advice. If you are coughing up blood, seek prompt medical evaluation.** ### Classification by Volume | Category | Volume | Clinical Significance | |---|---|---| | Mild (scant) | < 20 mL/day (blood-streaked sputum) | Most common presentation; often self-limited | | Moderate | 20–200 mL/day | Requires urgent investigation | | Massive | > 200 mL/day (some definitions use > 600 mL/24 h) | Life-threatening emergency; mortality 50–80% without intervention [3] | Massive hemoptysis, though representing only 5–15% of all hemoptysis cases, carries substantial mortality and demands immediate emergency management [3]. ## Common Causes The causes of hemoptysis are numerous, but they can be organized by mechanism and approximate frequency. The distribution of causes varies significantly by geographic region — for instance, tuberculosis is the leading cause in endemic areas, whereas bronchitis and lung cancer predominate in Western countries [1][2]. ### 1. Airway Diseases (Most Common — ~60–70% of Cases) - **Acute bronchitis**: The single most common cause of hemoptysis in outpatient settings in developed countries. Inflammation and mucosal irritation of the bronchial walls lead to capillary rupture. Typically produces blood-streaked sputum that resolves as the infection clears. - **Bronchiectasis**: Chronic structural dilation of the bronchi leads to damaged, hypertrophied bronchial arteries prone to bleeding. A major cause in patients with cystic fibrosis, prior tuberculosis, or recurrent infections. - **Chronic bronchitis / COPD**: Chronic airway inflammation may produce intermittent blood-streaked sputum, particularly during acute exacerbations. ### 2. Infections (~15–25%) - **Tuberculosis (TB)**: Globally, TB remains a leading cause of hemoptysis, particularly in Asia, Africa, and parts of South America. Cavitary disease erodes into pulmonary arteries (Rasmussen aneurysm), potentially causing massive hemorrhage. - **Pneumonia**: Bacterial pneumonias (especially *Staphylococcus aureus*, *Klebsiella pneumoniae*) and necrotizing pneumonias can cause parenchymal destruction with bloody sputum. - **Lung abscess**: Tissue necrosis and cavitation erode into adjacent vessels. - **Fungal infections**: Aspergilloma ("fungus ball") within a pre-existing cavity is a well-recognized cause of recurrent, sometimes massive hemoptysis. - **Parasitic infections**: In endemic regions, *Paragonimus* (lung fluke) is an important cause. ### 3. Malignancy (~15–25% in Older Adults) - **Bronchogenic carcinoma**: The most feared cause; hemoptysis is the presenting symptom in approximately 7–10% of lung cancers. Central tumors erode into bronchial vasculature [4]. - **Bronchial carcinoid**: Highly vascular endobronchial tumors. - **Pulmonary metastases**: Less commonly cause hemoptysis unless endobronchial involvement occurs. ### 4. Cardiovascular Causes (~5%) - **Pulmonary embolism (PE)**: Pulmonary infarction produces hemorrhagic necrosis of lung tissue. Hemoptysis occurs in roughly 13% of PE cases. - **Mitral stenosis**: Elevated left atrial and pulmonary venous pressures cause rupture of bronchial submucosal varices. - **Congestive heart failure**: Pulmonary congestion may produce pink, frothy sputum. ### 5. Vasculitis and Autoimmune Disorders (~2–5%) - **Granulomatosis with polyangiitis (GPA, formerly Wegener's)**: Necrotizing vasculitis affects pulmonary capillaries. - **Goodpasture syndrome**: Anti-GBM antibodies cause pulmonary-renal hemorrhage. - **Systemic lupus erythematosus (SLE)**: Diffuse alveolar hemorrhage is a rare but serious complication. ### 6. Iatrogenic and Other Causes - **Anticoagulant therapy**: Warfarin, DOACs, and heparin increase bleeding risk, though hemoptysis on anticoagulants should still prompt investigation for an underlying cause. - **Bronchoscopy or lung biopsy**: Post-procedural bleeding. - **Trauma**: Blunt or penetrating chest injury. - **Cryptogenic**: In 8–35% of cases, no definitive cause is identified despite thorough workup. Prognosis in cryptogenic hemoptysis is generally favorable [2]. ## RED FLAGS **Seek emergency medical care (call 911 or go to the nearest emergency department) if you experience any of the following:** - **Large-volume blood loss** — coughing up more than a teaspoon (roughly 5 mL) of frank blood at one time, or blood that keeps coming - **Blood that is bright red, copious, or does not stop** within minutes - **Difficulty breathing**, choking sensation, or inability to maintain a clear airway - **Dizziness, lightheadedness, or feeling faint** — may indicate significant blood loss - **Rapid heart rate** (palpitations) or **low blood pressure** symptoms - **Chest pain**, especially sudden-onset or pleuritic (worsens with breathing) - **Fever with bloody sputum** in the setting of known immunocompromise (HIV, chemotherapy, organ transplant) - **Known or suspected anticoagulant use** with ongoing hemoptysis - **History of lung cancer, pulmonary embolism, or recent surgery/immobilization** combined with new hemoptysis - **Accompanying leg swelling** (possible deep vein thrombosis suggesting PE) - **Unintentional weight loss, night sweats, or persistent cough** lasting more than 3 weeks alongside hemoptysis — concerning for malignancy or tuberculosis > **Important**: Even a single episode of true hemoptysis (not blood from a nosebleed or gum bleeding) warrants medical evaluation. Do not wait to see if it recurs. ## Self-Care at Home Because hemoptysis is a symptom of an underlying condition — and sometimes a serious one — **self-care measures are supportive only and are not a substitute for medical evaluation.** The following may be considered while awaiting medical assessment for mild, blood-streaked sputum: ### General Supportive Measures - **Stay calm.** Anxiety can raise blood pressure and heart rate, potentially worsening bleeding. - **Sit upright or lean slightly forward.** This positioning helps protect the unaffected lung and may reduce aspiration risk. - **Suppress vigorous coughing if possible.** Forceful coughing may worsen mucosal bleeding. Gentle coughing to clear the airway is acceptable. - **Avoid irritants.** Do not smoke or expose yourself to secondhand smoke, strong fumes, dust, or very cold/dry air. These can worsen airway inflammation. - **Humidify inhaled air.** Using a cool-mist humidifier may soothe irritated airways and reduce cough reflex. Keep the humidifier clean to prevent mold/bacterial growth. - **Stay hydrated.** Adequate fluid intake helps thin secretions. Warm (not hot) liquids such as water or herbal tea may be soothing. - **Rest.** Avoid strenuous physical activity until medically cleared, as exertion increases pulmonary blood flow and may worsen bleeding. - **Track the bleeding.** Note the amount (teaspoon, tablespoon), color (bright red, dark, pink-tinged), frequency, and any associated symptoms. This information is extremely valuable for your physician. ### What NOT to Do - **Do not take aspirin or NSAIDs** (ibuprofen, naproxen) without medical guidance, as these impair platelet function and may worsen bleeding. - **Do not ignore recurrent episodes**, even if small in volume. - **Do not attempt to "treat" hemoptysis with home remedies** found online (e.g., herbal coagulants) — these are unproven and may delay appropriate care. ## OTC Medications That Help **Critical caveat:** There is no over-the-counter medication that treats hemoptysis itself. OTC products may, however, address associated symptoms — particularly when the underlying cause is acute bronchitis or upper respiratory infection with blood-streaked sputum, and a clinician has confirmed that no serious pathology is present. | Class | Example | Typical Adult Dose | Notes | |---|---|---|---| | **Cough suppressant (antitussive)** | Dextromethorphan (Delsym, Robitussin DM) | 10–20 mg every 4 hours or 30 mg every 6–8 hours (max 120 mg/day) | May reduce cough-related mucosal trauma. Avoid in productive cough needed to clear secretions. Contraindicated with MAOIs. | | **Expectorant** | Guaifenesin (Mucinex) | 200–400 mg every 4 hours (max 2,400 mg/day) | Thins mucus, making expectoration less forceful. Does not stop bleeding. Drink plenty of water. | | **Throat lozenge / demulcent** | Menthol lozenges, honey-based lozenges | As directed on packaging | May soothe upper airway irritation and reduce cough reflex. Honey has mild evidence for cough suppression [5]. | | **Saline nasal spray** | 0.9% sodium chloride nasal spray | 1–2 sprays per nostril as needed | Useful only if concurrent nasal/post-nasal source is suspected; does not treat lower respiratory hemoptysis. | **Important warnings:** - **Avoid aspirin, ibuprofen, and naproxen** unless directed by a physician — these inhibit cyclooxygenase (COX) and impair platelet aggregation, potentially prolonging or worsening bleeding. - **Acetaminophen (paracetamol)** is generally preferred for pain or fever in the setting of hemoptysis, as it does not affect platelet function (typical adult dose: 500–1,000 mg every 4–6 hours, max 3,000–4,000 mg/day depending on guidelines and liver function). - **Do not use combination cold products** without checking all active ingredients — many contain NSAIDs or anticoagulant-interacting compounds. ## Prescription Options Prescription treatment of hemoptysis targets the underlying cause. The following table outlines commonly prescribed medication classes; all require a physician's evaluation and prescription. | Class | Examples | Indication | Prescribing Notes | |---|---|---|---| | **Antibiotics** | Amoxicillin-clavulanate, azithromycin, levofloxacin, anti-TB regimens (rifampin, isoniazid, pyrazinamide, ethambutol) | Bacterial pneumonia, acute exacerbation of COPD/bronchiectasis, tuberculosis | Choice depends on culture/sensitivity. TB requires multi-drug regimen for 6+ months under specialist guidance. | | **Antifungals** | Itraconazole, voriconazole | Aspergilloma, invasive pulmonary aspergillosis | Often used pre- or post-surgically. Hepatotoxicity monitoring required. | | **Anticoagulants (management/reversal)** | Vitamin K, idarucizumab (Praxbind), andexanet alfa (Andexxa), prothrombin complex concentrate (PCC) | Hemoptysis secondary to supratherapeutic anticoagulation | Reversal agents are used in emergency settings. Decision to hold or reverse anticoagulation requires specialist input weighing bleeding vs. thrombotic risk. | | **Antitussives (prescription-strength)** | Codeine, hydrocodone-containing cough suppressants | Severe cough contributing to mucosal hemorrhage | Opioid-based; risk of respiratory depression, sedation, dependence. Short-term use only. | | **Tranexamic acid (TXA)** | Oral or inhaled tranexamic acid | Adjunctive hemostasis in recurrent or moderate hemoptysis | An antifibrinolytic that stabilizes clots. A 2018 systematic review showed benefit of inhaled TXA in reducing hemoptysis duration and volume, though evidence remains limited [6]. Typically 500 mg inhaled via nebulizer TID, or 1 g oral TID. | | **Bronchial artery embolization (BAE)** | Interventional radiology procedure (not a medication) | Moderate-to-massive hemoptysis, failed medical management | First-line intervention for massive hemoptysis; success rate 70–99% acutely [3]. Recurrence rate 10–30% at 1 year. | | **Chemotherapy / targeted therapy / immunotherapy** | Platinum-based regimens, tyrosine kinase inhibitors, checkpoint inhibitors | Hemoptysis secondary to lung malignancy | Managed by oncology. Note: bevacizumab (anti-VEGF) is generally contraindicated in squamous cell lung cancer due to risk of fatal hemoptysis. | | **Immunosuppressants** | Cyclophosphamide, rituximab, corticosteroids (high-dose) | Diffuse alveolar hemorrhage from vasculitis (GPA, Goodpasture, SLE) | Managed by rheumatology/pulmonology. Requires close monitoring for infection and cytopenias. | **Who prescribes:** - **Primary care physicians** manage mild hemoptysis from bronchitis, prescribe initial antibiotics, and coordinate workup. - **Pulmonologists** manage complex or recurrent hemoptysis, perform bronchoscopy, and guide long-term treatment. - **Interventional radiologists** perform bronchial artery embolization. - **Cardiothoracic surgeons** may be consulted for surgical resection in cases of massive hemoptysis refractory to embolization, localized bronchiectasis, or resectable tumors. - **Oncologists** manage malignancy-related hemoptysis. - **Infectious disease specialists** guide tuberculosis and complex fungal infection management. ## Lab Tests Typically Ordered A thorough workup for hemoptysis generally includes laboratory, imaging, and procedural investigations. The specific tests depend on clinical suspicion, but the following are commonly ordered: | Test | Rationale | |---|---| | **Complete blood count (CBC)** | Assess hemoglobin/hematocrit to evaluate blood loss severity; white cell count for infection; platelet count for coagulopathy. [See: /tests/complete-blood-count](/tests/complete-blood-count) | | **Coagulation panel (PT/INR, aPTT)** | Identify coagulopathy or supratherapeutic anticoagulation as a contributing factor. [See: /tests/coagulation-panel](/tests/coagulation-panel) | | **Basic metabolic panel (BMP) / Renal function** | Renal impairment may suggest pulmonary-renal syndrome (Goodpasture, GPA). [See: /tests/basic-metabolic-panel](/tests/basic-metabolic-panel) | | **Type and screen / crossmatch** | Preparedness for transfusion if significant blood loss occurs or is anticipated. | | **Sputum culture and sensitivity** | Identify bacterial pathogens in suspected pneumonia or bronchiectasis exacerbation. | | **Sputum for acid-fast bacilli (AFB) smear and culture** | Rule out active tuberculosis, especially in patients with risk factors (endemic area exposure, immunosuppression, characteristic imaging). [See: /tests/afb-smear-culture](/tests/afb-smear-culture) | | **Sputum cytology** | Screen for malignant cells; low sensitivity (~50–60%) but useful adjunct when bronchoscopy is deferred. | | **D-dimer** | Elevated in pulmonary embolism (high sensitivity, low specificity). Used alongside Wells score or PERC rule. [See: /tests/d-dimer](/tests/d-dimer) | | **Arterial blood gas (ABG)** | Assess oxygenation and ventilation in moderate-to-severe hemoptysis or respiratory distress. | | **Anti-GBM antibodies** | Diagnose Goodpasture syndrome when diffuse alveolar hemorrhage with renal involvement is suspected. | | **ANCA (anti-neutrophil cytoplasmic antibodies)** | c-ANCA (PR3) for granulomatosis with polyangiitis; p-ANCA (MPO) for microscopic polyangiitis. [See: /tests/anca](/tests/anca) | | **ANA and complement levels** | Evaluate for SLE-related diffuse alveolar hemorrhage. | | **BNP / NT-proBNP** | Assess for heart failure as a cause of pink frothy sputum. [See: /tests/bnp](/tests/bnp) | ### Imaging - **Chest X-ray (posteroanterior and lateral)**: First-line imaging; may reveal infiltrates, masses, cavities, or cardiomegaly. - **CT chest with contrast (CT angiography)**: Gold standard imaging for hemoptysis workup. Identifies parenchymal lesions, bronchiectasis, pulmonary emboli, and vascular abnormalities with high sensitivity. - **CT pulmonary angiography (CTPA)**: Specifically indicated when pulmonary embolism is suspected. ### Procedures - **Bronchoscopy**: Indicated when CT is non-diagnostic, hemoptysis is recurrent, malignancy is suspected, or therapeutic intervention (endobronchial hemostasis) is needed. Flexible bronchoscopy is preferred for stable patients; rigid bronchoscopy is reserved for massive hemoptysis requiring airway control. ## Special Populations ### Children Hemoptysis in children is less common than in adults and has a different differential diagnosis: - **Common causes in children**: Lower respiratory tract infections, foreign body aspiration, cystic fibrosis-related bronchiectasis, and pulmonary hemosiderosis. - **Lung cancer is exceedingly rare** in children; infectious and congenital causes predominate. - **Foreign body aspiration** should be suspected in any child under 4 years with sudden-onset coughing and hemoptysis. - **Medication considerations**: OTC cough suppressants (dextromethorphan) should generally not be used in children under 4 years (and many guidelines advise against them under 6 years). **Do not administer codeine-containing products to children under 12 years** — the FDA issued a black-box warning due to risk of respiratory depression from ultra-rapid CYP2D6 metabolism [7]. - **Always consult a pediatrician** before giving any medication to a child with hemoptysis. ### Pregnancy - Hemoptysis during pregnancy requires the same urgency of evaluation as in non-pregnant patients. - **Physiologic changes**: Increased blood volume and cardiac output during pregnancy may increase bleeding risk from pre-existing lesions. - **Pulmonary embolism** is an important consideration, as pregnancy is a hypercoagulable state. The incidence of PE is approximately 1 in 1,000 pregnancies. - **Imaging considerations**: Chest X-ray with abdominal shielding is considered safe. CT pulmonary angiography may be performed when PE is suspected — fetal radiation dose is very low (< 0.1 mGy). V/Q scan is an alternative. - **Medication safety**: - **Tranexamic acid**: Generally considered compatible with pregnancy (used in postpartum hemorrhage), but should be used only under obstetric/specialist guidance for hemoptysis. - **Dextromethorphan**: Generally considered low-risk in pregnancy (no increased teratogenic risk in human data), but should be used only if benefit outweighs risk. - **Codeine**: FDA Pregnancy Category C; potential for neonatal withdrawal and respiratory depression. Avoid if possible. - **Antibiotics**: Penicillins and macrolides (except clarithromycin) are generally considered safe. Fluoroquinolones and tetracyclines should be avoided. ### Elderly (≥ 65 years) - The probability of malignancy as a cause of hemoptysis increases significantly with age. Patients over 40 with hemoptysis, particularly smokers or ex-smokers, require thorough malignancy evaluation [4]. - **Anticoagulant use** is more prevalent in elderly populations (for atrial fibrillation, mechanical valves, VTE prophylaxis), complicating management. - **Renal and hepatic impairment** are more common and affect drug dosing — acetaminophen should be limited to ≤ 2,000 mg/day in patients with hepatic compromise. - **Polypharmacy**: Carefully review all medications for drug interactions, particularly with anticoagulants and antiplatelets. - **TB reactivation**: Elderly patients, particularly those from endemic regions or with a history of latent TB, are at increased risk. ### Athletes - **Exercise-induced hemoptysis** is a recognized phenomenon, particularly in endurance athletes (runners, cyclists, swimmers). It may result from elevated pulmonary capillary pressures during intense exertion leading to stress failure of the pulmonary capillary wall. - Generally self-limited and benign, but **other causes must be excluded** before attributing hemoptysis to exercise alone. - Athletes on anticoagulants (rare but possible in those with congenital thrombophilias or mechanical valves) face additional risk. - **Return to sport**: Should be guided by the treating physician. Athletes should not resume intense training until the cause is identified and appropriately managed. ## When to Escalate Use the following guide to determine the appropriate level of care. **When in doubt, always err on the side of seeking more urgent evaluation.** ### Call 911 / Go to the ER Immediately - Coughing up more than a few teaspoons of blood - Blood is bright red and does not stop - Any difficulty breathing, choking, or airway compromise - Signs of shock: lightheadedness, rapid pulse, cold/clammy skin, confusion - Known or suspected pulmonary embolism (sudden chest pain, shortness of breath, leg swelling) - Hemoptysis after chest trauma ### Urgent Care / Same-Day GP Appointment - First episode of blood-streaked sputum in an otherwise stable patient - Mild hemoptysis with fever, suggesting an acute respiratory infection - Known bronchiectasis or COPD with a change in baseline sputum character - Patient on anticoagulant therapy with new hemoptysis (if stable and not large-volume) ### Routine GP Visit (Within 1–2 Weeks) - Resolved single episode of faint blood-streaking with a clear, likely benign cause (e.g., known acute bronchitis, vigorous coughing) - **However**, patients over 40 with risk factors for lung cancer (smoking history, occupational exposures, family history) should be seen sooner rather than later ### Specialist Referral (Pulmonology) - Recurrent hemoptysis without a clear cause - Abnormal chest imaging (mass, cavity, unexplained infiltrate) - Hemoptysis lasting more than 1 week despite treatment of an underlying infection - Known or suspected bronchiectasis for long-term management - Need for bronchoscopy > **Remember**: Hemoptysis is one of the symptoms where the threshold for medical evaluation should be low. A 2005 review in *American Family Physician* emphasized that even patients with a single episode of hemoptysis and a normal chest X-ray may have an underlying malignancy in up to 6% of cases, particularly if they are over 40 with a smoking history [1]. ## References [1] Bidwell JL, Pachner RW. Hemoptysis: diagnosis and management. *Am Fam Physician*. 2005;72(7):1253-1260. PMID:16225028. [2] Earwood JS, Thompson TD. Hemoptysis: evaluation and management. *Am Fam Physician*. 2015;91(4):243-248. PMID:25955624. [3] Sakr L, Dutau H. Massive hemoptysis: an update on the role of bronchoscopy in diagnosis and management. *Respiration*. 2010;80(1):38-58. PMID:20090288. [4] Defined in: NICE. Suspected cancer: recognition and referral [NG12]. National Institute for Health and Care Excellence. Updated 2023. Available at: https://www.nice.org.uk/guidance/ng12. Recommends urgent chest X-ray for adults ≥40 with unexplained hemoptysis. [5] Oduwole O, Udoh EE, Oyo-Ita A, Meremikwu MM. Honey for acute cough in children. *Cochrane Database Syst Rev*. 2018;4(4):CD007094. PMID:29633783. [6] Moen CA, Burrell A, Dunning J. Does tranexamic acid stop haemoptysis? *Interact Cardiovasc Thorac Surg*. 2013;17(6):991-994. PMID:23956264. [7] U.S. Food and Drug Administration. FDA Drug Safety Communication: FDA restricts use of prescription codeine pain and cough medicines and tramadol pain medicines in children; recommends against use in breastfeeding women. April 2017. Available at: https://www.fda.gov/drugs/drug-safety-and-availability/fda-drug-safety-communication-fda-restricts-use-prescription-codeine-pain-and-cough-medicines-and. [8] Ibrahim WH. Massive haemoptysis: the definition should be revised. *Eur Respir J*. 2008;32(4):1131. PMID:18827163. [9] Jean-Baptiste E. Clinical assessment and management of massive hemoptysis. *Crit Care Med*. 2000;28(5):1642-1647. PMID:10834728. --- *Disclaimer: This article is intended for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition. If you are coughing up blood, contact your healthcare provider promptly or seek emergency medical attention.*