Sometimes the balance center in your inner ear is the cause of the nausea. Related symptoms Gastritis and heartburn are the most common related symptoms. In severe cases diarrhea may occur as well, so the intestines are also affected. Headaches are common with nausea. Unpleasant odors make some people nauseous, especially rotting flesh.
Migraine headaches have nausea as a common associated symptom.
If nausea is accompanied by severe pain around one eye and blurred vision, you may have acute glaucoma . Call your doctor at once. A bout of nausea sometimes is a sign of serious illness such as a heart attack , acute stomach problems, and some kidney or liver disorders. If you see red or black blood in vomit, call your doctor at once. Persistent nausea is one of the main warning signs of cancer .