What is the cause of back pain? lower right side to the middle. really bothering. nothing changes in life style. have lower abdominal discomfort too

Depends: 30's female notes low back & abdominal discomforts, but neglects to tell us if symptoms are acute or chronic. Assuming chronic, one must consider smoldering UTI, PID, & SIJ disorder with attendant IBS. After infection tests have been cleared, then an Osteopathic exam might prove useful; especially to discover signs of sacroiliac joint disorder and to rule out Joint Hypermobility Syndrome.