Nausea is a feeling of sickness with an inclination to vomit. Nausea may be symptomatic of many conditions, including infection, food poisoning, motion sickness, overeating, blocked intestine, illness, concussion or brain injury, appendicitis, and migraines. They can also be a reaction to medications.

Endocrine disorders result from the dysfunction of the glands that produce hormones. Hyperthyroidism, hypothyroidism, and adrenal insufficiency are among the more common endocrine disorders. Symptoms can include fatigue, stomach upset, dehydration, and skin changes.

Digestive and bowel disorders include colitis, Crohn’s disease, inflammatory bowel disease (IBD), and irritable bowel syndrome (IBS) and may cause pain, nausea, vomiting, bloating, constipation, diarrhea, or fatigue.