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Does Caffeine Trigger or Treat Headaches?
http://www.headaches.org/2009/07/24/does-caffeine-trigger-or-treat-headaches/

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 “vasoconstrictive” properties that cause the blood vessels to narrow and restrict blood flow, caffeine can aid in head pain relief.
When caffeine is added to the combination of acetaminophen and aspirin, the pain relieving effect is increased by 40%.

Though caffeine does not directly cause headache, too much of the substance can trigger “caffeine rebound.” A caffeine rebound headache occurs from withdrawal of caffeine after a sufferer continually consumes too much of the substance.
Though the physical side effects can be severe, only 2% of the population suffers from caffeine rebound.

Although most headache sufferers can consume up to 200 mg. per day, the NHF advises patients with frequent headaches to avoid daily use.
The average American consumes about 200-300 mg of caffeine a day (or the equivalent of 2-3 cups of drip coffee).

To help monitor caffeine intake, the NHF provides you with a chart that supplies the caffeine content for several foods and beverages.