Soreness and weakness after a cold is a symptom caused by inflammation and fever in the human body. 1. Inflammation: colds are acute upper respiratory tract infections, the body of the virus reproduction caused by the inflammatory response, the virus in the blood constantly replicating, into the body cells to cause harm to the human body, the body’s immune system to make defense, the emergence of a generalized inflammatory response, which will lead to weakness, body aches and pains in the symptoms. 2. Human body fever: in the human body fever, will affect the biological activity of various chemical enzymes in the body, the body of the accumulation of acidic substances, thus affecting the biochemical reactions in the body, so fever will lead to metabolic reactions in the body to speed up, consume a lot of energy, causing the symptoms of body aches and pains. If the symptoms are serious, it is recommended to go to the hospital in time to avoid unnecessary harm to the body.