The characteristics of cancer leg pain are all caused by bone metastasis in the leg, and soft tissue metastasis is not excluded, and there are other carcinoid syndromes, all of which can be clearly diagnosed through imaging and pathological examination. The degree of cancer leg pain ranges from dull pain to deep and severe pain, which is more intense, with fixed pain points, intermittently or continuously increasing day by day, and more obvious when the patient moves and bears weight, and more serious at night, causing fear and anxiety before sleep, which affects the patient’s sleep. When a pathological fracture occurs, the patient’s movement is limited, and percussion pain can occur when tapping on the area.