Suffering from heart disease, kidney stones, stomach disease and other diseases is to try not to drink coffee. 1. Heart disease: coffee contains caffeine, if patients with heart disease drink a lot of coffee, may stimulate the heart, resulting in increased heart rate, if the heart has been beating too fast will increase myocardial oxygen consumption, palpitations, myocardial ischemia, respiratory distress and other phenomena, resulting in aggravation of the condition. 2. Kidney stones: coffee contains a lot of oxalic acid, kidney stones are generally a large number of crystalline substances in the kidneys caused by the accumulation, if the patient has kidney stones after drinking coffee will cause a large number of oxalic acid in the body accumulation, so that the kidney stones become larger, renal colic, hematuria and other conditions. 3. Stomach disease: because of some factors will make the patient appear stomach upset, coffee on the stomach of the strong stimulation, will lead to excessive secretion of gastric acid in the stomach, heartburn, acid reflux, nausea and vomiting and other symptoms, the serious cases will appear gastric ulcers. Coffee also has a good aspect to the human body, such as refreshing the mind, in daily life, the general population without the above mentioned diseases when appropriate to drink is no problem.