Diet soda can cause headaches

If headaches occur frequently, it may be due to the habit of eating diet soda. “Diet soda contains caffeine and caffeine shrinks blood vessels, which can cause headaches in some people,” Williams said. “Caffeine is a diuretic that can lead to dehydration, another possible cause of headaches.”

If you are a person who suffers from a headache without caffeine, it may mean that artificial sweeteners such as aspartame and sucralose are related to headaches.