Weakness in the legs: 1. It may be due to neurological lesions that cause nerve compression, resulting in clinical symptoms of weakness in the innervated areas, including the legs. 2. It may also be due to degenerative lesions of the knee joint, resulting in weakness in the knee joint during walking due to destruction of the joint structure, chronic inflammation, and the formation of osteophytes, resulting in unstable walking. 3. Spasm or chronic strain injury, resulting in a decrease in the elasticity of the leg muscles, weight-bearing capacity, and easy to occur in the walking process of leg weakness symptoms. So the symptoms of leg weakness, if there is no relief or progressive aggravation within a short period of time, you must promptly go to a regular hospital, improve the relevant examination, choose a reasonable treatment method, do not delay the disease.