Tea and blood pressure

Caffeine in tea can temporarily raise blood pressure. The size and duration of the response vary; drinking tea regularly does not guarantee no response. Choosing a tea to treat high or low blood pressure is not a reliable approach.

Jin Jun Mei tea in a small tasting cup.
Photo: Difference engine · CC BY-SA 4.0

Keep tea separate from treatment

Some studies of green tea and its extracts report small reductions in blood pressure with sustained use. Results vary, and an extract is not equivalent to a cup of tea. This does not justify replacing treatment or changing prescribed doses. GABA tea cannot be promised to treat blood pressure either.

Consider caffeine, not just smooth taste

Shu, aged white tea and GABA oolong contain caffeine. A smooth taste and L-theanine do not guarantee protection from its effects. Short infusions alone do not solve this: all the tea you drink counts. If you need less caffeine, reduce the amount or choose decaffeinated tea and check its label.

Check how tea fits your treatment

If you have hypertension, discuss a suitable amount with your clinician, particularly if your pressure is poorly controlled or you have palpitations. Explain how much tea you drink and how you prepare it. Green tea can interact with nadolol; ask a clinician or pharmacist to check other medicines too. Do not add tea extracts to manage blood pressure.

Take readings under consistent conditions

Before a routine home reading, avoid caffeine, smoking and exercise for at least 30 minutes. Then sit quietly for 5 minutes, with your back and arm supported, feet flat and the cuff on a bare arm at heart level. Take two readings a minute apart and record them. This is preparation for measurement, not the time it takes caffeine to leave your body.

Questions and answers

Can strong tea treat low blood pressure?

Do not use strong tea to treat weakness or dizziness: these can have several causes. Seek medical advice for recurring symptoms. Chest pain, fainting or difficulty breathing need urgent medical help.

How long until pressure is back to normal after tea?

There is no universal time. A single reading does not establish a link with tea: activity, stress and measurement conditions matter too. If you see a recurring pattern, show your clinician a log of readings and caffeine times.