Amplified heartbeat and heartburn

Tea and coffee have a lot of caffeine that potentially stimulates the central nervous system, and can thereby increase your heart rate. Caffeine also relaxes the esophagus, contributing to gastroesophageal reflux that can exacerbate heartburn.
Jitters and anxiety

Caffeine has the potential to stimulate hormones, especially adrenaline that can give jitters to your body. It also gives a heightened sense in some individuals, making them feel anxious.
Dehydration

Regular diarrhea and urination can cause dehydration that disrupts the body’s fluid balance, making it low in water, vitamins and minerals that are required for the body’s smooth functioning.
Insomnia

Drinking too much coffee or tea interferes with the activities of neurotransmitters called Adenosine, which is a natural tranquilizer of your brain. Due to a high quantity of caffeine, the Adenosine activity can get inhibited, making it difficult for you to sleep.
Addictive

Coffee and tea can be addictive because caffeine has a tendency to trigger alertness. This is caused through release of a chemical that the body needs to prevent withdrawal symptoms of depression and headaches.Image source: Getty