**R11.0 — Nausea** is used when the sensation of needing to vomit is documented as the primary symptom without actual emesis. R11.10 is for vomiting alone, R11.2 for both nausea and vomiting.
This symptom code is common in emergency, oncology, and primary care. Underlying causes range widely: gastrointestinal, vestibular, metabolic, drug-induced, pregnancy.
Belongs to **Chapter R** — Symptoms, signs.
