- Chemotherapy and radiation therapy - Antibiotics (e.g., erythromycin, azithromycin) - Opioid painkillers - Alcohol - Tobacco - Illegal drug use (e.g., marijuana, cocaine)
Other
- Allergies - Anxiety and stress - Psychological disorders (e.g., anorexia nervosa, bulimia) - Nausea caused by medications or anesthesia - Vestibular disorders (e.g., labyrinthitis) - Neurological disorders that affect the vomiting center in the brain (e.g., Parkinson's disease)