Low back pain and small stomach pain, and farting, may be due to the following reasons: 1. There may be lumbar spine and pelvis related injuries. If the patient falls from a high place, resulting in lumbar spine and pelvis related injuries, or even fractures. This may result in massive bleeding and nerve irritation, which in turn leads to the symptoms mentioned above.2. It may be caused by some prevalent tuberculosis. If the patient develops tuberculosis in the spine as well as inside the abdominal cavity, it is possible to cause the above symptoms due to the stimulation of the lumbar nerve roots and the stimulation of the gastrointestinal tract.3. It may be due to diseases such as stones or tumors related to the urinary system. Once the above diseases appear, they can also cause stimulation of the lumbar and abdominal regions at the same time, which in turn causes the above symptoms.4. Such symptoms are caused by lesions related to the gastrointestinal tract. However, if the primary disease is in the gastrointestinal tract, it suggests that the scope of the lesion may be wider. It may exist in the whole colon, and involve the sigmoid colon and rectum in the pelvis, and then produce related inflammation, tumor, infection and so on.