Blood is a common phenomenon in our daily lives, but every time we pass by a blood donation van, we are afraid to roll up our sleeves. What are the disadvantages of donating blood? Here is a brief introduction to you. 1.Blood donation can reduce blood viscosity Blood donation can reduce blood viscosity, can improve blood flow rate, so it can relieve and prevent hyperviscosity. 2.Blood donation can enhance the hematopoietic function Blood donation can enhance the hematopoietic skill. As long as we donate blood several times, we will be more responsive to the decrease of blood and the speed of blood replenishment will be faster, so we can keep the hematopoietic function in a vigorous state. 3.Blood donation can reduce cardiovascular diseases Blood donation can reduce cardiovascular diseases, because the important factors that trigger heart disease are excess iron and copper in the blood, so the appropriate amount of scientific blood donation can reduce the excess iron and copper in the blood, thus reducing the occurrence of cardiovascular diseases. 4, blood donation can promote metabolism Blood donation can promote metabolism, a large number of blood cells in our body are aging and dying, while new blood cells are being born and growing, so after blood donation, the blood in the body is reduced, will stimulate the hematopoietic organs to accelerate the production of blood cells, the newly generated young blood cells, not only can transport more oxygen and nutrients to the whole body, but also has a strong ability to swallow viruses and The newly produced young blood cells can not only transport more oxygen and nutrients to the whole body, but also have a strong ability to swallow viruses and resist diseases, which can prolong life. In addition to the benefits of blood donation mentioned above, blood donation also has certain disadvantages. Blood donation may cause fainting. 6. Blood donation may cause anemia. If the donor is malnourished and gives blood too many times in a short period of time, anemia may occur. 7. Blood donation may be infected with diseases. Dark blood may be infected with diseases, which are caused by the lack of strict sterilization and sharing of blood drawing equipment, but this phenomenon does not exist as long as it belongs to the regular national blood collection institutions.