Getting up with pain is mainly due to three aspects: 1, before going to bed during the day too much activity, excessive fatigue of muscle tissue to form a strain, in the activity of the circulation is relatively fast, the metabolites are able to effectively metabolize in a timely manner, is not prone to build up, so the symptoms are not obvious, but in the state of rest when the blood circulation will be slowed down, which will lead to metabolites increase, build up, in the get up when you will feel pain all over the body. 2, cold at night, because the human body in the cold after the muscle tissue will become more tense, blood circulation will slow down, after the slowing of venous return, will lead to the human body produces lactic acid, inflammation and other metabolites continue to build up, increase, to a certain extent, will also cause the symptoms of pain in the body, will also have to get up after the pain in the body. 3, feel the influenza virus If you are infected with the flu virus, the metabolites produced by the virus will stimulate the human body, so you will experience body aches and pains.