Trunk muscles refer to the muscle groups on the human trunk, including back muscles, pectoral muscles, diaphragm, abdominal muscles and perineal muscles. 1. Back muscle: located behind the trunk, including superficial obliques and latissimus dorsi, etc., and deep muscles such as sacrospinal muscles. 2. Pectoral muscles: the pectoral muscles are divided into upper thoracic muscles and intrinsic thoracic muscles, including pectoralis major, pectoralis minor and serratus anterior. 3. Diaphragm: The diaphragm is a flat muscle that separates the thoracic cavity and the abdominal cavity, and closes the lower thorax, with the diaphragm expanding upward in the form of a dome. The diaphragm is an important respiratory muscle. 4. Abdominal muscles: abdominal muscles are involved in the formation of the anterior, lateral and posterior walls of the abdominal cavity, which are divided into the anterolateral and posterior groups, including the external abdominal obliquity, internal abdominal obliquity, rectus abdominis, transversus abdominis and so on. 5. Perineal muscle: Perineal muscle refers to the muscles that close the lower mouth of the small pelvis, mainly the anorectalis, perineum superficial, deep transverse muscle, urethral sphincter and so on. If the above trunk muscle discomfort in time to the hospital, improve the relevant examination, a clear diagnosis and follow the doctor’s instructions for treatment, so as not to delay the condition.