The possible causes of pain and numbness in the left bladder, that is, the left shoulder and the left leg are cervical spondylosis, osteoporosis, diabetes, and so on. 1. Cervical spondylosis: cervical spondylosis appears left spinal cord pressure symptoms, such as control of the left side of the limbs of the nerve lesions, resulting in the left bladder and left leg soreness and swelling phenomenon. 2. Osteoporosis: a metabolic disease characterized by decreased bone mass and microstructural changes in bone tissue, resulting in increased brittleness of bones and decreased hardness, and its main symptom is diffuse bone pain, which may also occur in the left leg of the left leg of the left bladder, numbness and distension of the situation. 3. Diabetes: diabetes because of systemic vascular disease affecting the peripheral nerves, can also appear left limb sensory impairment, manifested as numbness and pain, but also can appear motor function is limited. Left bladder left leg numbness and pain may also have other reasons, may be the right side of the brain caused by lesions, mainly seen in cerebrovascular disease. It is recommended to go to the hospital in time to identify the cause of the disease, symptomatic treatment, so as not to delay the condition.