Right chest and shoulder discomfort is mainly caused by physiological strain, frozen shoulder, cervical spondylosis, breast disease, lung cancer, bone fracture and other reasons. 1. Physiological strain injury, such as muscle and nerve overstrain, leads to local pain and discomfort, which can be relieved after rest. 2. Frozen shoulder, which mostly occurs in middle-aged people around 50 years old, accompanied by limited movement of shoulder joints, and the pain is more obvious at night. 3. Cervical spondylosis, caused by the compression of the right side of the cervical spondylosis nerve root, some accompanied by the numbness of the right upper limb discomfort. 4. Breast diseases, such as acute mastitis or breast tumors, resulting in involvement of the condition. 5. Lung cancer, which invades the 1st and 2nd ribs and brachial plexus nerves, causing pain and discomfort in the chest and shoulder. 6. Soft tissue injury caused by trauma, dislocation of shoulder joint, fracture of clavicle, etc. can also cause chest and shoulder discomfort. There are many reasons for right-sided chest and shoulder discomfort, which need to be combined with medical history, physical examination and auxiliary examination to further clarify the diagnosis.