Bladder menstrual pain in the back, there are muscle, lumbar spine, spinal causes, as well as urinary and digestive causes, as follows:1. Muscle, lumbar spine, spinal causes: the most common is acute or chronic muscle injuries, when bending for a long period of time, the back muscles may be fatigued, spasms caused by bladder menstrual pain. Herniated lumbar discs or anterior displacement of the spine is also a common cause of bladder meridian pain.2. Problems in the urinary system: In the urinary system, injuries to the kidneys, ureters and bladder can also cause back pain in the area where the bladder meridian belongs to, in addition to kidney stones can also be bladder meridian pain.3. Digestive causes: special cases of bladder meridian reflex pain can also occur in specific types of appendicitis, gastric perforation or cholecystitis. Therefore, if the bladder meridian pain in the back, often indicates that there is an organ disease, you need to carry out timely examination to determine the cause of the disease.