The numbness of thigh root and feet after prostate cancer surgery may be related to the compression of nerves by bone metastasis, after-effects of chemotherapy, surgical damage to the nerves or blood vessels related to the pelvic floor, and may also be related to other diseases. 1. Bone metastasis compressing nerves: prostate cancer patients with bone metastasis of cancer cells will have pain at the metastatic site; cancer cells destroy spinal cord and compress lumbar nerves, resulting in nerve dysfunction of the lower limbs, and the pain often occurs in the joints of the limbs and manifests as impaired mobility and numbness of thighs. 2. Sequelae of chemotherapy: advanced prostate cancer patients usually undergo chemotherapy, chemotherapy drugs have certain toxicity, and side effects occur after chemotherapy, causing damage to peripheral sensory nerves, and patients will experience numbness of thigh roots and feet. 3. Surgery-related complications, radical prostatectomy for prostate cancer may damage the nerves and blood vessels related to the pelvic floor, which may lead to direct damage to the nerves or damage to blood vessels, and nerve damage or ischemia may occur, resulting in numbness. 4. Other diseases: peripheral neuropathy (such as diabetes mellitus), lumbar spine disease (such as lumbar disc herniation), brain lesions, etc. may lead to numbness in the thighs and feet. Postoperative thigh root numbness feet also numb symptoms, if continued to get no relief, should promptly consult a doctor to identify the cause of the disease, symptomatic treatment.