Latissimus dorsi muscle pain may be caused by physiological reasons such as excessive exercise, or it may be caused by pathologic reasons such as trauma and myofasciitis. 1. Physiological reasons: such as excessive exercise and other causes of lactic acid accumulation in the back, thus appearing physiological latissimus dorsi pain. This is a physiological phenomenon, don’t worry too much, generally can be relieved after rest. 2. Pathologic causes (1) Trauma: the latissimus dorsi muscle can play more roles and functions, if the latissimus dorsi muscle is injured in daily life, it may lead to local capillary rupture, injury, oozing blood on the nerve stimulation, which leads to pain, usually accompanied by local symptoms such as bruising, redness and swelling. (2) Myofasciitis: The latissimus dorsi muscle, fascia and other symptoms of aseptic inflammation due to trauma, cold, overexertion and other reasons, can appear latissimus dorsi pain. Latissimus dorsi muscle pain may also be caused by other reasons. If it is not relieved after resting, it is recommended to go to the hospital to improve the relevant examination, and after clarifying the cause, follow the doctor’s instructions for further treatment to avoid delaying the condition.