Thickening of the ligamentum flavum may compress the nerves presenting low back pain, soreness and numbness in the legs, and may seriously affect walking. The ligamentum flavum is a part of the spinal canal that stabilizes the spine on both sides of the spinal canal. Repeated injuries to the ligamentum flavum due to exertion, disease, etc. may result in thickening of the ligamentum flavum. Mild thickening of the ligamentum flavum does not significantly compress the nerves, and there is generally no special discomfort. Thickening of the ligamentum flavum is heavier, and when there is compression of the nerve, there may be low back pain, leg pain and numbness, and sometimes there are walking disorders, such as claudication, etc. Surgery may be needed to remove the thickened ligamentum flavum to alleviate the compression of the nerve. The thickening of ligamentum flavum should go to the regular hospital in time, by the doctor according to the symptoms, signs and auxiliary examination to determine the specific cause of the disease, for the cause of the disease to give the correct treatment.