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 .
Cancer in various organs, including the lungs , can push on the stomach or esophagus , producing nausea. See a physician for persistent nausea of unknown origin. If you feel nauseous and are taking a new medication, call your doctor to review your situation. Some prescriptions or combinations of drugs can cause nausea. If after trying several home remedies you still feel like throwing up, it may be best to go ahead and vomit.