The reasons for the bulging of the acromion bone on the shoulder can be categorized into physiological and pathological reasons. Physiological reasons include: thinness or underdeveloped local muscles, which makes the acromion bone visually relatively convex; pathological reasons include dislocation of the shoulder joint, dislocation of the humeral head, osteophytes and so on. 1. Physiological reasons: as the bones on the shoulder are mainly the joints composed of scapula and clavicle, if they are relatively thin or young, and the local muscles are not developed, the bones will appear to be visually relatively protruding, which is a physiological phenomenon and does not need special treatment. 2. Dislocation of shoulder joint and humeral head: the shoulder joint or humeral head is dislocated so that the clavicle head or part of the bone of the scapula protrudes, and this situation needs timely examination to determine the type of dislocation and the direction of displacement through CT scan. If there is obvious dislocation, it is necessary to carry out timely reset, and suspension fixation and other related treatment. 3. Osteomalacia: Long-term chronic strain can cause osteophytes and other conditions, causing shoulder bone protrusion, this situation needs to pay attention to rest, if the diagnosis is not dislocated, you can gradually carry out physical therapy, hot compresses and other related measures to alleviate the symptoms. There are many reasons for the protruding of the acromion bone on the shoulder, if it is physiological reason, then there is no need to do special treatment, if it is pathological reason or you can’t judge the reason clearly, please consult a doctor for symptomatic treatment in time, so as to avoid delaying to make the condition deteriorate.