Answers:
Most headache are cause by dehydration.
Teas are awesome (especially herbals) but you call for to drink marine to even out the diuretic effect.
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FYI population who enjoy already answered.
Normal teas do hold caffeine and some herbal teas are stimulants but most of them arent and dont enjoy caffeine.
quit drinking it. it may be interacting next to you prescription medication. look up headache at medlineplus.com
The same sense coffee supply some populace headache. Caffine. Check and see if it have caffine in it.