1. Caffeine as a pain reliever
Caffeine in coffee stimulates the brain and nervous system, which can help improve concentration and increase alertness. Caffeine in coffee also acts as a vasoconstrictor, which can narrow blood vessels, helping to relieve headaches.
Additionally, caffeine can help combat the fatigue and drowsiness that often accompany headaches. By stimulating the central nervous system, coffee can help you feel more alert and improve your ability to concentrate, which can reduce the discomfort of mild headaches.
2. Reasons why coffee causes headaches
- Caffeine withdrawal headaches: This is a common symptom that occurs when a person who regularly consumes caffeine reduces or stops consuming caffeine altogether. Caffeine withdrawal headaches occur when caffeine suddenly stops stimulating the central nervous system. These headaches can feel similar to regular tension headaches or, in some cases, migraines.
- Excessive consumption: Drinking too much coffee can cause headaches. In a 2023 study published in Scientific Reports, the rate of severe headaches was 42% higher in participants who consumed more than 400 milligrams of caffeine per day than those who did not.
- Dehydration: Caffeine is a diuretic, which can increase urine output. Drinking too much coffee can lead to dehydration, which is a common cause of headaches.
