There are several reasons for the weakness of the whole body after a cold: First, lack of potassium, because in the cold often input antibiotics and hormonal drugs, such drugs will cause the loss of potassium ions in the body after use, causing a lack of potassium in the body, and the weakness of the limbs and even the weakness of the legs. Second, after the cold and fever, the body will hurt Jin and consume Qi, the body is overdrawn and consumed, need to rest well, generally it takes three days to recover well after the cold. These days, the diet should be light, avoid spicy, stimulating food. Third, there is another situation is that after the cold caused by the lack of qi and blood, need more rest, eat more nutritious things.