how does caffeine relieve headaches
Share this with others: Caffeine can be a headache trigger or headache inhibitor. Caffeine can be found in beverages, chocolate and even in some popular over-the-counter and prescription pain relievers. Before a headache or migraine, blood vessels tend to enlarge. Because it contains âvasoconstrictiveâ properties that cause the blood vessels to narrow and restrict blood flow, caffeine can aid in head pain relief.