Successful colonoscopy 6 mo ago. 1.8 cm slip of l5-s1 pain below bellybutton but across entire lower abdomen constant sensation on tip of penis. why?

More likely: from your spine (spinal stenosis) than your bowels! Hope this is helpful Dr Z

Not related: Not likely related. The lower abdomen is supplied by nerves that exit the spine well above the L5-S1 level, so it is unlikely that your abdominal complaints are directly related to your back. Might need to seek further work up.

May we ask...: ...what your colonoscopy showed, as well as the result of other tests that may have been performed, so we can offer an opinion?