There are more reasons for always having back pain, which may be related to menstruation, lumbar muscle strain, lumbar myofasciitis and so on. 1. Menstruation: When women are menstruating, they will feel fatigue due to changes in the endocrine environment. At the same time, due to the congestion of the pelvic floor during menstruation, there will be symptoms of lumbosacral pain. 2. Lumbar muscle strain: people who sit for a long time or work bent over for a long time may suffer muscle strain due to poor posture. Muscle strain will cause lumbar back pain. 3. Lumbar Fasciitis: Cold after weather changes or chronic muscle strain, causing aseptic inflammation of muscles and fascia. It often manifests as diffuse soreness in the back and lumbar region. Always appear lumbar pain, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.