Two shoulder pain and lack of energy, can be considered strenuous exercise, cervical spondylosis, as well as cold and fever and other conditions caused by, it is recommended to go to the hospital for further examination to clarify the cause of the disease. 1. Strenuous exercise: If you engage in heavy labor such as long-time carrying work after a long period of no exercise, or swimming and other high-intensity physical activities, it may lead to a large accumulation of lactic acid in the muscles, causing shoulder pain and lack of energy. 2. Cervical spondylosis: If you suffer from cervical spondylosis, the herniated intervertebral discs may compress the nerves and spinal cord, resulting in shoulder pain and generalized numbness and weakness. 3. Cold and fever: When cold and flu are caused by bacterial or viral infection, fever may occur due to viremia, which often causes shoulder pain and general weakness. It is recommended to go to the hospital for further examination under the guidance of the doctor to clarify the cause of the disease.