Although the effect of blood donation on health is not great and there is almost no abnormal feeling, it will also cause a temporary decrease in the body’s resistance, and a few people may also suffer from general weakness, headache and dizziness. During this period of time to pay attention to rest, can drink more water to strengthen nutrition, avoid eating spicy, stimulating food, if not pay attention to drinking, smoking will aggravate the headache, dizziness and other adverse reactions, but also cause liver and kidney function damage, it is best not to drink and smoke after the blood draw, a week later there is no great impact, usually drinking and smoking more on the body is also very big, especially Smoking, it is best to quit smoking, drinking should also be limited.