Could you tell me what black, coffee bean sized bits in poo could mean. and also white stringy stuff as well? thank you.

Constipation: Small sized stool round in shape means it has been sitting in the colon for a long time and all the water is absorbed and has formed pebbles. Diarrhea caused by stool softner is probably water flowing around impacted stool. Have to cleanse the bowel. Avoid white flour, meat and use more green vegetables and fruits. Drink a lot of water. Treat constipation aggressively. See the dr. If not better.