1, generally it will not cause harm to the body. Normal people can donate blood four times a year, 200 ml to 300 ml each time, which will not affect the body. If one-time blood donation is too much or too frequent, it may lead to low immunity or low blood protein and coagulation dysfunction.

2. Appropriate blood donation can promote the metabolism of the body and the hematopoietic function of bone marrow. After donating blood, it will also reduce the blood viscosity of red blood cells and platelets, promote blood circulation and reduce the occurrence of cardiovascular and cerebrovascular diseases. When donating blood, the requirements for age and physical health are strict.