Symptoms of back pain after taking Anrotinib may be caused by side effects. It may also be caused by lumbar muscle strain, lumbar disc herniation and other diseases. Anrotinib is a commonly used clinical targeted drug for the treatment of non-small cell lung cancer, small cell lung cancer, clear cell sarcoma and other diseases. The side effects of this drug include kidney damage, which can lead to proteinuria, musculoskeletal pain, etc., which can cause patients to experience back pain. In addition, when the patients themselves combined with lumbar muscle strain, lumbar disc herniation and other diseases, they will also have symptoms of back pain. Therefore, patients need to consult the doctor in time to clarify the cause of the disease and avoid aggravating the development of the disease.