What could be the cause of lower back pain one year after kidney cancer surgery?

Possible causes of lower back pain one year after kidney cancer surgery include: 1. Fatigue and trauma: If patients engage in heavy physical labor or experience腰部 trauma after surgery, it may lead to muscle spasms or damage to local soft tissues, causing pain. 2. Nephritis: Patients with pre-existing nephritis may experience increased kidney burden after kidney cancer surgery, leading to back pain. 3. Postoperative complications: Certain complications following kidney cancer surgery, such as comprehensive complications after renal tumor embolization, may manifest as lower back pain. 4. Metastasis or spread: Kidney cancer may metastasize or spread within one year after surgery, infiltrating the lumbar nerves or causing distant metastases that result in psoas major muscle pain. Patients are advised to seek immediate medical attention to determine the exact cause through thorough examination and receive appropriate treatment and care under a doctor's guidance.