Food allergies to tea are extremely rare. Tea allergy usually takes the form of respiratory issues or skin problems for people who work in tea packing or processing, who become sensitized to it over an extended period.
People react differently to caffeine, with some people being so sensitive to its effects that they cannot tolerate even small amounts. The symptoms of caffeine sensitivity or intolerance are wide ranging but easy to recognize if you know what to expect.
Insomnia is the most common symptom of caffeine sensitivity. Trouble falling asleep, restless sleep, waking up during sleep and not feeling refreshed after sleep.
- Caffeine can cause nervousness.
- Caffeine intake is associated with jitteriness and unease.
- Caffeine can exacerbate stomach problems.
Some of the relatively common but often overlooked symptoms of caffeine sensitivity include stomach upset, diarrhea and stomach pain or discomfort.
The least common but most serious signs and symptoms of caffeine sensitivity are high blood pressure and heart side effects.
People with severe heart disease or a heart rhythm abnormality and caffeine sensitivity may be advised to avoid dietary caffeine.