Strange Causes of Headaches That Have Nothing to Do With Dehydration

19. Blue Light Exposure: More Than Just Eye Strain

Staring at a screen all day does more than tire your eyes—it can mess with your brain’s circadian rhythm. Blue light from phones, tablets, and computers suppresses melatonin, leading to poor sleep, increased eye strain, and headaches. If you’re prone to screen-induced headaches, try using blue light blocking glasses, activating night mode on devices, and taking regular breaks using the 20-20-20 rule (every 20 minutes, look 20 feet away for 20 seconds).

20. Underlying Vitamin Deficiencies: The Missing Nutrients

Lack of key nutrients can be a silent headache trigger. Deficiencies in magnesium, vitamin D, B vitamins (especially B2 and B12), and CoQ10 have been linked to frequent headaches and migraines. Magnesium, in particular, helps regulate nerve function and relax blood vessels, preventing tension headaches. If you’re getting frequent headaches, consider getting a blood test to check for deficiencies and incorporating more nutrient-rich foods or supplements into your diet.