There are several possible causes of lumbar pain after standing for a long time: first, lumbar muscle strain, lumbar muscle strain is due to chronic injury to the muscles of the lumbar region, and the symptoms of lumbar pain, especially when standing for a long time or in the morning when the lumbar pain is more serious, it is necessary to carry out relevant investigations and examinations to exclude other diseases for diagnosis; second, lumbar dorsal myofasciitis, patients with lumbar myofasciitis can also appear to stand This is often caused by chronic aseptic inflammation of the fascia of the lumbar dorsal muscles, which can be aggravated by cold and exertion, and can also be aggravated by pain when waking up in the morning. The muscles are not able to support the lumbar region after standing for a long time, and thus the symptoms of lumbar pain appear, and then X-ray and CT examinations of the lumbar spine should be performed for early diagnosis and treatment.