There are many causes of subcutaneous fasciitis of the lower back, such as long-term heavy physical labor, long-term improper posture and too cold and damp environment. 1. Long-term heavy physical labor: Long-term heavy physical labor on the low back leads to strain on the soft tissues of the low back, causing aseptic inflammation, which leads to the occurrence of subcutaneous fasciitis of the low back. 2. Improper posture for a long time: Improper posture for long-term work and study causes aseptic inflammation of the lower back, which leads to the occurrence of subcutaneous fasciitis of the lower back. 3. Cold and wet environment: working in a cold and wet environment for a long time can make the blood vessels of the muscles of the lower back contract and become ischemic, causing local inflammation, which leads to the occurrence of subcutaneous fasciitis of the lower back. There are many causes of subcutaneous fasciitis of the lower back, so it is recommended to go to a regular hospital, consult a professional doctor, and cooperate with the doctor to complete the relevant examinations and standardized treatment.