Why Do I Have A Headache Nausea And Hot Flashes?

Why Do I Have A Headache Nausea And Hot Flashes? These symptoms and signs occur with gastroenteritis, food poisoning, a sinus infection, otitis media (ear infection), pheochromocytoma, serotonin syndrome, or poisoning with carbon monoxide or another toxin. What does it mean when you feel nauseous and have a headache? Migraines are the most common cause