The phenomenon of soreness and swelling in the left arm is a relatively common phenomenon, and there are many reasons for it. For example, if a patient has cervical spondylosis, especially neurogenic cervical spondylosis, the nerve roots are stimulated and compressed, resulting in soreness and swelling in the area innervated by the nerves, as well as loss of skin sensation, muscle strength and finger dexterity in the arm. In addition, if the patient has a long-term chronic injury to the left arm, resulting in old damage to the muscles of the arm, the inflammatory factors in the muscles will affect the normal metabolism of lactic acid in the muscles, and the patient will also have soreness and swelling, and local pain. Patients can be instructed to reduce the amount of activity bed rest, or elevate the arm, and can also use heat treatment, can make the soreness and swelling phenomenon can be relieved.