The left clavicle is more prominent than the right may have several conditions: 1, congenital dysplasia. Some people’s left clavicle is naturally more prominent than the right, belongs to the congenital dysplasia, belongs to a relatively normal physiological phenomenon. This generally does not have any symptoms and does not require treatment. 2, trauma. If there is a history of trauma, external impact may dislocate the left acromioclavicular joint and make the left side more prominent than the right side, so it is recommended to consult a hospital, have an X-ray examination to clarify the cause and deal with the symptoms. 3. Bone cysts. If there is a bone cyst in the left acromioclavicular joint, it may cause the left clavicle to protrude more than the right. 4. Acromioclavicular arthritis. Long-term strain or wind and cold may lead to inflammation of the left acromioclavicular joint, accompanied by difficulty in lifting the shoulder joint, resulting in the protrusion of the left clavicle compared to the right, so you can give symptomatic treatment such as Siwipu for pain relief and Cefaclor capsules for anti-inflammation.