Legs feel weak and sore every day may be due to overwork, calcium deficiency, lumbar disc herniation, etc. Different treatments are available depending on the cause of the disease, which can be relieved by rest, calcium supplementation, surgery, and so on. 1. Overwork: Standing for a long time every day may lead to overwork of leg muscles, causing accumulation of lactic acid, resulting in weakness and soreness of the legs. Generally, there is no need for special treatment, and patients should avoid standing for a long time and ensure sufficient rest, which can be gradually relieved after resting. 2. Calcium deficiency: Calcium deficiency will lead to increased neuromuscular excitability, resulting in leg muscle contraction and diastolic dysfunction, causing leg weakness and acidity. It can be treated with calcium supplements and more nutritious food such as meat, eggs and milk should be consumed. 3. Herniated lumbar intervertebral disc: Herniated lumbar intervertebral disc compressing the nerves will cause motor and sensory disorders in the legs, resulting in fatigue and soreness. It can be treated by bed rest, ibuprofen, methylcobalamin and other medications, or lumbar traction and other conservative treatments, conservative treatment is not effective in the feasibility of surgical treatment to remove the protruding nucleus pulposus. The legs feel weak and achy every day, you should go to the hospital in time to improve the examination, clear diagnosis and timely treatment of the cause.