31 Strange Causes of Headaches That Have Nothing to Do With Dehydration
16. High Histamine Foods: Aged, Fermented, and Smoked Foods

Histamine is a naturally occurring compound in the body that plays a role in immune function, digestion, and the nervous system. However, for some people, consuming histamine-rich foods can trigger headaches. Aged cheeses, smoked meats, red wine, fermented foods (like sauerkraut and kimchi), and even avocado are all high in histamine. If you suspect histamine intolerance, keeping a food journal may help identify which foods trigger your headaches.