Heartburn

Tea's caffeine content may cause heartburn or worsen pre-existing acid reflux symptoms. Caffeine appears to relax the sphincter that divides your esophagus from your stomach, allowing acidic stomach contents to flow more readily into the esophagus.

Caffeine may also help to boost overall stomach acid production. Of course, drinking tea does not always result in heartburn. People have drastically varied reactions to the same meals. However, if you regularly consume big amounts of tea and frequently suffer from heartburn, it may be useful to restrict your intake and see if your symptoms improve.