Is coffee a headache elixir or poison? Experts analyze it like this.

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Some people are used to having a cup of coffee when they have a headache. does coffee really relieve headaches? The Huffington Post reported the answer: coffee may ease his headache, but it makes your headache worse, and the results vary from person to person and from headache to cause.

Kirsten Ransbury, a California dietitian, says caffeine helps constrict blood vessels and reduce swelling and relieve pain caused by swollen blood vessels in the brain. Caffeine also relieves tension headaches by relaxing the scalp and the muscles behind the head, explains Kiran F. Rajneesh, director of the neuralgia department at Ohio State University's Wexner Medical Center.

But the trouble is that if you eat too much caffeine, it will make your nervous muscles more tense and aggravate the headache.

So how much caffeine is the right amount? Experts say there is no "prescription" for everyone because coffee has a different effect on everyone. Some people who are particularly sensitive to caffeine advise against using coffee as a painkiller. In terms of daily consumption, one or two cups is enough, and three to four cups are the bottom line, Ransbury says.

Coffee, tea, chocolate and carbonated drinks are common sources of caffeine, and Ransbury warns to be especially careful with energy drinks, as eating too much can cause dizziness, seizures and strokes. Rajneesh does not recommend energy drinks to relieve headaches at all, "because many of these drinks contain nerve stimulants that may aggravate headaches."

"I think coffee is probably the mildest of these drinks." Carbonated drinks contain sugar and other chemicals and may affect health, Rajneesh said.

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