i'm sorry to hear you're experiencing this. i hope you feel better soon. unfortunately it's impossible to say what's going on without a physical exam and possibly other tests (such as an x-ray or mri). you don't say what your age is but it's important to remember men can get osteoporosis just like women. among many possible causes for your pain is a stress fracture of the pelvis due to osteoporosis. of course many other conditions could be contributing to the pain you're experiencing. your best bet is to get an examination by a medical professional. you can start with your primary care provider. he or she will guide you toward appropriate treatment if necessary. best wishes to you!
why do i have pain in the back of my left pelvic just below the illac crest. i am male and have a history of back pain.