According to different symptoms, you should consult different departments, such as orthopedics, vascular surgery, endocrinology, etc. Orthopedics: If the weakness of legs is accompanied by numbness, it may be due to lumbar disc herniation or lumbar spinal disc herniation. 1. Orthopedics: If both legs are weak and tender, accompanied by numbness and radiating pain from the lower back to the buttocks, the back of the thighs, and the outer side of the calves until the feet, it may be lumbar disc herniation or lumbar spinal stenosis, etc., so you should hang up with Orthopedics for consultation. 2. Vascular Surgery: If the legs are weak and achy and the lower limbs are cold at the same time, it may be deep vein thrombosis and other diseases, and you should consult the Vascular Surgery Department. 3. Endocrinology: If the weakness of lower limbs is accompanied by excessive sweating, palpitation or acute gastroenteritis, it may be hypokalemia, and endocrinology should be consulted. If the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.