Why does my poop not come all the way out?

Online Answer
It usually means that something is affecting your rectum (the part of the colon by your anus). Causes of tenesmus include irritable bowel syndrome or ulcerative colitis. In some cases, you may actually have stool left behind (incomplete evacuation of stool).
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Mushroom poisoning, also called toadstool poisoning, toxic, sometimes fatal, effect of eating poisonous mushrooms (toadstools). ... There are some 70 to 80 species of mushrooms that are poisonous to humans.
Bananas, rice, applesauce, and toast The best (and most recommended) diet to follow when experiencing diarrhea is the BRAT diet. This curiously named food plan stands for: Bananas, rice, applesauce, and toast. Notice a trend? These bland foods are low-fiber, which will help firm your stool and calm your stomach.
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Type 6 – Mushy consistency with ragged edges, looking more like a pile than clear separate stools. Type 7 – Liquid in form, containing no solid pieces.
Stool comes in a range of colors. All shades of brown and even green are considered normal. Only rarely does stool color indicate a potentially serious intestinal condition. Stool color is generally influenced by what you eat as well as by the amount of bile — a yellow-green fluid that digests fats — in your stool..