If you drink coffee regularly, it will cause the following harm to the human body: 1. Acting on the heart, it will cause arrhythmia, tachycardia, etc. due to excessive caffeine intake. Caffeine will make the sympathetic nerve overexcitation, in the sympathetic nerve overexcitation, will make the heartbeat increase, so there will be arrhythmia, tachycardia, etc. 2, will make the kidneys appear a certain overload, often drink coffee will play the role of diuretic, this is because the caffeine in coffee has the role of inhibiting the production of antidiuretic hormone, so more coffee will cause damage to the kidneys. 3, often Drinking coffee will cause some damage to the digestive system, especially the stomach mucosa will cause the release of excessive gastric acid, so long-term, large amounts of coffee will lead to stomach problems.