What Is Nausea?
Nausea is a feeling of sickness with an inclination to vomit. Nausea and vomiting are not diseases, but symptoms of many different 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. Nausea and vomiting can sometimes be symptoms of more serious diseases such as heart attacks, kidney or liver disorders, central nervous system disorders, brain tumors, and some forms of cancer.