Nausea and vomiting may occur separately or together. Common causes include:

1. Chemotherapy
2. Gastroparesis (a condition in which the muscles of the stomach wall don't function properly, interfering with digestion)
3. General anesthesia
4. Intestinal obstruction — when something blocks food or liquid from moving through the small or large intestine.
5. Migraine
6. Morning sickness
7. Motion sickness: First aid
8. Rotavirus or infections caused by other viruses.
9. Viral gastroenteritis (stomach flu)
10. Vestibular neuritis

Other possible causes of nausea and vomiting include:

1. Acute liver failure
2. Alcohol use disorder
3. Anaphylaxis
4. Anorexia nervosa
5. Appendicitis — when the appendix becomes inflamed.
6. Benign paroxysmal positional vertigo (BPPV)
7. Brain tumor
8. Bulimia nervosa
9. Cannabis (marijuana) use
10. Cholecystitis
11. Coronavirus disease 2019 (COVID-19)
12. Crohn's disease — which causes tissues in the digestive tract to become inflamed.
13. Cyclic vomiting syndrome
14. Depression (major depressive disorder)
15. Diabetic ketoacidosis (in which the body has high levels of blood acids called ketones)
16. Dizziness
17. Ear infection (middle ear)
18. Enlarged spleen (splenomegaly)
19. Fever
20. Food allergy (for example, cow's milk, soy or eggs)
21. Food poisoning
22. Gallstones
23. Gastroesophageal reflux disease (GERD)
24. Generalized anxiety disorder
25. Heart attack
26. Heart failure — a condition in which the heart doesn't pump blood as well as it should.
27. Hepatitis
28. Hiatal hernia
29. Hydrocephalus
30. Hyperparathyroidism (overactive parathyroid)
31. Hyperthyroidism (overactive thyroid) also known as overactive thyroid.
32. Hypoparathyroidism (underactive parathyroid)
33. Intestinal ischemia
34. Intestinal obstruction — when something blocks food or liquid from moving through the small or large intestine.
35. Intracranial hematoma
36. Intussusception (in children)
37. Irritable bowel syndrome — a group of symptoms that affect the stomach and intestines.
38. Medications (including aspirin, nonsteroidal anti-inflammatories, oral contraceptives, digitalis, narcotics and antibiotics)
39. Meniere's disease
40. Meningitis
41. Pancreatic cancer
42. Pancreatitis
43. Peptic ulcer
44. Pseudotumor cerebri (idiopathic intracranial hypertension)
45. Pyloric stenosis (in infants)
46. Radiation therapy
47. Severe pain
48. Toxic hepatitis