Pain in the lower back after exertion, the following causes are common: First, lumbar muscle strain: lumbar muscle strain can easily occur after exertion, and excessive accumulation of lactic acid in the muscle will produce clinical symptoms of lumbar pain, which is more common in daily life. After rest and massage treatment, the clinical symptoms can be relieved. Second, lumbar spine diseases: such as lumbar disc herniation, lumbar spine trauma or fracture, etc., will also have clinical symptoms of lumbar pain after exertion, usually with heavy pain, and can involve one lower limb, causing lower limb limping. Therefore, when lumbar pain occurs after exertion, early diagnosis and early treatment are necessary to achieve significant relief of clinical symptoms. Patients should avoid overexertion and strengthen the strength training of the lumbar back muscles and control their weight to prevent the recurrence of low back pain symptoms.