Feeling hard belly with pain sometimes, continous constipation, feeling like stomach is full but only little poop is coming out.lower back pain.

Probably Diet: If you have other symptoms like fever, sever local abdominal pain or darkening urine, get medical evaluation. Have you tried non-prescription laxative, stool softeners (dss), glycerin suppositories? Consider adding a bulk former like psyllium seed (metamucil) to soften your stool. Also, make sure you get at least 30gm of fiber daily.