Coffee does not reduce swelling, and certain special people should be cautious of drinking coffee. The caffeine content in coffee can effectively accelerate blood circulation, increase renal perfusion, and accelerate the speed of fluid elimination from the body. However, this ability to promote the discharge of body fluids can not be compared with diuretics and other drugs, if the symptoms of edema caused by certain diseases, it is not recommended to drink coffee to reduce swelling. In addition, some special people are not recommended to drink coffee. Patients suffering from hypertension, coronary heart disease and other cardiovascular diseases may aggravate their condition if they drink coffee for a long time or in large quantities. Patients suffering from chronic gastritis and other gastrointestinal diseases are also not recommended to drink coffee, so as not to worsen the condition or cause acute gastric ulcers or even perforation. Because of the refreshing effect of coffee, insomnia patients are also not recommended to drink. In case of obvious edema, it is recommended to consult a doctor for further clarification of the cause of edema. In daily life, please drink coffee according to your own condition after eliminating the relevant contraindications, and it is not recommended to drink it excessively.