What could cause pain in my belly bottom that extend the the anus area?

Several issues: The intestines are in the abdominal area and ultimately end at the anus, so many issues in the intestinal area can cause pain issues. See the Dr. if this continues.

Lower abdominal pain: All pelvic organs culd contribute to your pain . I need more history to pinpoint it . in general you could have a bladder infection , a bought of Diverticulitis , Ovarian Cyst , Problems with constipation , Kidney stones . See a physician for evaluation .