The causes of lumbar muscle strain generally include two points: First, after an acute lumbar injury, such as a sprain or trauma, proper treatment is not administered, and sufficient rest is not taken when needed, leading to improper treatment and eventually resulting in chronic lumbar muscle strain. The second point, which is also the main reason, is due to the lumbar region being in a state of continuous tension during prolonged work. This causes the muscles in the lumbar region to be under constant stress, then compressing the small blood vessels, leading to insufficient oxygen supply to the lumbar muscles, and causing metabolic byproducts like lactic acid to accumulate. This eventually stimulates local inflammatory responses that contribute to injury. Initially, the muscles themselves can make some compensatory adjustments. However, as the condition worsens, this ability to regulate increasingly diminishes until it can no longer adjust, leading then to compensatory regulation, also known as serial compensatory adjustment. Thus, if lumbar muscle strain is not treated properly or in a timely manner, the condition will progressively worsen, eventually causing the lumbar muscles to lose their original function and potentially leading to a deformity in the lumbar region. Therefore, the main reasons for lumbar muscle strain are firstly, improper treatment during the acute phase that transitions into chronic lumbar muscle strain, and secondly, the lumbar muscles being in a state of long-term overload, ultimately leading to strain.