Lower limb weakness, unsteady walking, constipation and abdominal distension are usually caused by cerebrovascular diseases, brain tumors, lumbar spondylosis and neurosis. 1. Cerebrovascular disease: for example, cerebral hemorrhage, cerebral infarction, cerebral thrombosis, because cerebrovascular disease affects the brain function will lead to weakness of the lower limbs, unsteady walking, constipation and abdominal distension and other symptoms, the patient needs to do the brain CT, cerebral blood flow, blood lipids, blood pressure and other related examinations. 2. Electrolyte metabolism disorders: when intestinal obstruction is combined with electrolyte metabolism disorders, such as low potassium, lower limb weakness, abdominal distension and constipation can be produced. Timely supplementation of fluids and electrolytes is needed to correct the metabolic disorders in the body. 3. Lumbar spondylosis: for example, lumbar disc herniation, lumbar spondylosis will affect the nerve function when it presses on the nerve, resulting in unstable walking, weakness of the lower limbs, constipation, abdominal distension and other symptoms. Surgery is needed when necessary. 4. Neurosis: Neurosis is related to mental and psychological factors, when the mood is not good, the condition will worsen, the patient can also appear lower limb weakness, unsteady walking, constipation and abdominal distension and other symptoms. Lower limb weakness, unsteady walking, constipation and abdominal distension of the crowd need to timely consultation, do not delay the condition, do not eat indiscriminately, in accordance with the standard treatment under the guidance of the physician interview.