Left bladder pain may be caused by the following reasons: 1, common is caused by frozen shoulder, frozen shoulder is caused by aseptic inflammation, usually occurs in middle-aged and older people over 40 years of age, can cause shoulder pain, and accompanied by shoulder joint activities in all directions are limited, headache caused by frozen shoulder can be radiated to the upper arm, scapula region, pain is more pronounced at night. 2, caused by the pain of the left bladder, the reason is caused by shoulder and neck musculoskeletal inflammation. The cause of left bladder pain is caused by myofasciitis of the shoulder and neck, generally this kind of pain is usually accompanied by neck pain, without limitation of shoulder joint activities.3, rotator cuff injury can cause left bladder pain, also known as acromioclavicular impingement syndrome, is due to biceps femoris, longissimus muscle tendonitis and caused by the left bladder pain, you can carry out magnetic resonance imaging and other auxiliary tests to clarify the diagnosis.