If a pain lasts for so long, it is always necessary to rule out the worst - large intestine cancer! As there is no characteristic symptoms of colon cancer
should be performed in every unexplained pain of an abdomen. Especially if there is constipation
or diarrheas history, blood or mucous in stool, mild anemia
in blood tests or lost of weight. Ultrasound
is very inaccurate exam.
If colonoscopy will show nothing it is advisable to perform abdomen CT.
Yours wife abdomen pain cant be explained by uterus knot as it usually give no symptoms at all.
And one more thing. Before running colonoscopy it would be good idea to visit a surgeon who would rule an inguinal hernia out.