Left shoulder, neck and bladder pain may be caused by physiological factors, neck diseases, shoulder diseases, heart diseases and other factors. 1. Physiological factors: If you are used to sleeping on your side, it leads to long time pressure on the left shoulder and arm, resulting in left shoulder, neck and bladder pain. In addition, if you perform strenuous exercise, such as playing basketball, bowling, etc., you may experience pain in the left shoulder and arm. 2. Neck diseases: when suffering from cervical spondylosis, cervical spine inflammation, cervical spine tumor, cervical spine tuberculosis, cervical disc herniation, brachial plexus neuritis, cervical spine soft tissue injury and other diseases, may lead to pain in the left shoulder, neck and bladder, weakness of the upper limbs, limited neck movement and other symptoms. 3. Shoulder diseases: If you suffer from rotator cuff injury, shoulder or arm trauma, shoulder or arm muscle strain, frozen shoulder and other diseases, it is easy to cause shoulder, neck and bladder pain, shoulder joint weakness, limited shoulder movement, shoulder muscle spasm and other symptoms. 4. Heart disease: If you suffer from myocardial infarction, pleurisy, coronary heart disease and other diseases, it may also lead to the left shoulder, neck and bladder or arm pain. There are many reasons for left shoulder, neck and bladder pain, you should go to the hospital in time for examination, under the guidance of the doctor to give appropriate treatment and therapy to avoid aggravation of the condition.