Weakness in the legs may be caused by muscle fatigue, varicose veins in the lower extremities, and venous thrombosis. The causes of the disease are different and the treatment methods are different. Common treatments include general treatment, medication, surgery and so on. 1. Muscle fatigue: If standing for a long time or exercising with too much intensity leads to muscle and fascia strain and lactic acid accumulation, the legs may have a feeling of weakness. This condition does not require special treatment and can usually be recovered through adequate rest. Hot compresses and stretching of the legs can be used to promote blood circulation and the decomposition of lactic acid to improve and relieve the discomfort of the legs. 2. Varicose veins of the lower limbs: If you stand or sit for a long time, the venous blood flow is stagnant in the lower limbs, resulting in venous valve dysfunction in the lower limbs, varicose veins and poor blood flow, which can lead to weakness of the legs. You can wear compression stockings and intermittent elevation of the lower limbs to help blood return. The use of vasoactive drugs such as Diosmin can increase venous tone and improve poor blood flow in the lower limbs, thus relieving leg weakness. 3. Venous thrombosis: venous thrombosis caused by stagnation of venous blood flow in the lower limbs will block venous blood return and cause edema of the lower limbs, which in turn will cause weakness of the legs. At this time, anticoagulant drugs such as heparin can be used to avoid blood stagnation and prevent embolism from worsening. In severe cases, the thrombus can be removed surgically, such as catheter thrombectomy. Removal of the thrombus can relieve swelling of the lower limbs and weakness of the legs. In addition, weakness of the legs may be caused by lumbar spinal stenosis, lumbar disc herniation compressing the nerves, and so on. It is recommended that the patient go to the hospital in time for the doctor to diagnose the cause and give targeted treatment.