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Black Tea Side Effects: 7 Health Risks of Overconsumption

Black tea contains caffeine and tannins that can inhibit iron absorption, disrupt sleep, raise blood pressure, worsen IBS symptoms, reduce calcium absorption, cause nausea on empty stomach, and trigger acid reflux when consumed excessively.

  • 12 May 2025
  • 3 min read
  • 10 views

Black tea is made by oxidizing the leaves of the Camellia sinensis plant, which darkens the leaves and enhances the flavour. It contains flavonoids, a type of antioxidant that supports heart health. While generally beneficial, excessive consumption can lead to side effects due to its high caffeine content.

Some of the black tea side effects are listed below.

Black tea side effects

The disadvantages of drinking black tea in excess for a long period are as follows:

  1. Anaemia: Tannins and bioflavonoids in black tea inhibit iron absorption. This may lead to anaemia.
  1. Sleep disturbance: The caffeine in black tea can make it hard to fall asleep, so avoid drinking it close to bedtime.
  1. High blood pressure: The caffeine in black tea can increase blood pressure. Thus, if you already have hypertension, drink the beverage in moderation.
  1. Irritable bowel syndrome: Black tea can worsen symptoms of irritable bowel syndrome (IBS).
  1. Brittle bones: Black tea increases the amount of calcium flushed out in urine. If you have osteoporosis, limit the intake.
  1. Nausea: The tannins in the tea can make you feel nauseated, especially if you consume it on an empty stomach or in large amounts. Tannins' astringent nature can also irritate digestive tissues, leading to stomach aches.
  1. Heartburn: The caffeine in black tea may relax the lower oesophageal sphincter and increase stomach acid production, which can aggravate acid reflux symptoms.

Conclusion

Black tea should be consumed in moderation to avoid potential health issues. If unsure, consult a healthcare provider to determine the right intake for you.

Additionally, it is essential to secure your health with preventive measures. Having medical insurance will ensure quality treatment without financial stress. You can obtain family health insurance to cover your entire family.

 


Disclaimer: The information provided in this blog is for educational and informational purposes only. It is not intended as a substitute for professional advice, diagnosis or treatment. Please consult a certified medical and/or nutrition professional for any questions. Relying on any information provided in this blog is solely at your own risk, and ICICI Lombard is not responsible for any effects or consequences resulting from the use of the information shared

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