There are several common causes of pain in the legs: the first is chronic strain or acute injury to the soft tissues of the lower extremities, resulting in inflammatory reactions to congestion and edema in the soft tissues, which can produce painful sensations in the legs. The second can be seen in skeletal diseases, including structural changes in bone, bone injury, bone tumors, and abnormal bone metabolism due to metabolic reasons, which can also produce painful symptoms accordingly. The third can be seen in lumbar spine diseases, which cause nerve root compression in the lower extremities, resulting in radiating pain in the lower extremities. The fourth can be seen in systemic diseases, such as systemic metabolic diseases, such as hypoparathyroidism, abnormal thyroid function, abnormal kidney function, including gout, and so on. There are also systemic immune diseases and connective tissue diseases that may cause painful symptoms. It is recommended that temporary supportive and symptomatic treatment be observed, and if no relief is seen in the short term, prompt medical consultation is recommended.