Calcification of ligamentum flavum is related to long-term physical labor, genetic factors, degenerative changes, trauma and so on. 1. Long-term physical labor: mainly seen in long-term low head, stooping labor crowd, can lead to ligamentum flavum hypertrophy, induced ligamentum flavum ossificans. 2. Genetic factors: calcification of the ligamentum flavum has a certain hereditary tendency, and the incidence of the disease in the immediate family members is significantly higher, and there is a tendency of family aggregation, but the specific genetic mechanism is not clear. 3. Degenerative changes: degenerative changes of the ligamentum flavum often occur in the elderly, which can lead to calcification of the ligamentum flavum. 4. Trauma: previous trauma leads to spinal deformity on the ligamentum flavum extrusion and abrasion, resulting in ligamentum flavum hypertrophy, inducing ligamentum flavum calcification. This symptom alone is not enough to diagnose the disease, and may be caused by other factors. It is recommended to consult a doctor in time to clarify the cause of the disease and give targeted treatment.