The main reasons for the nodules on the outside of the abdominal muscles include physiological factors and pathologic factors, etc. The main reasons for the nodules on the outside of the abdominal muscles include physiological factors and pathologic factors. 1. Physiological factors: mainly due to long-term fatigue injury and spasm of the abdominal muscles. Physiological factors can lead to repeated congestion, tearing and repair of the abdominal muscles and fascia, and the repair process may lead to the emergence of subcutaneous fascial adhesions, which, if not dealt with in a timely manner or stretched, will lead to the emergence of nodules on the outside of the abdominal muscles. 2. Pathological factors: mainly including trauma, surgery, infection, such as abdominal contusion, cesarean section, subcutaneous lymphadenitis. Pathological factors damage to the abdominal muscles, the body will be through the granulation tissue proliferation, wrapped in local damage caused by necrotic tissue or apoptosis of the cell mass, and then transformed into a collagen fibrous tissue-based scar, and then the appearance of subcutaneous nodules. Abdominal muscles outside all the nodules may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.