Strange Causes of Headaches That Have Nothing to Do With Dehydration

15. Air Quality: Pollutants and Fragrances

If you often get headaches indoors, it might not be stress—it could be the air you’re breathing. Strong perfumes, scented candles, cleaning products, and even car exhaust release volatile organic compounds (VOCs) that can irritate the nervous system and trigger headaches. Poor indoor air quality from dust, mold, or stale air can also contribute to discomfort. To reduce your risk, try using natural, fragrance-free products, improving ventilation, and adding air-purifying plants like peace lilies or snake plants to your space.

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.