Headaches

Caffeine use on an intermittent basis may help relieve certain forms of headaches. When taken repeatedly, though, the reverse effect might occur. Caffeine consumption from tea on a regular basis may lead to persistent headaches. According to some studies, as little as 100 mg of caffeine per day may contribute to daily headache recurrence, although the exact quantity necessary to induce a headache might vary depending on an individual's tolerance.

Tea has less caffeine than other common caffeinated beverages, such as soda or coffee, although certain varieties can have up to 60 mg of caffeine per cup (240 ml). If you get recurring headaches and suspect they are caused by your tea consumption, consider lowering or removing them from your diet for a period to see if your symptoms improve.