My stomach hurts my poop comes out in pieces with thick white mucus an feels like there is more but nothing comes out what's that mean?

Constipation: Constipation likely. High fiber diet metamucil excellent increase water intake. If persists see physician. Low potasium high calcium dehydration thyroid disease medication including narcotic pain meds all can cause. Some you can adjust for some requires medical attention and testing.

Mucus & more...: Mucus occurs in up to 50% of patients with irritable bowel syndrome, with or without pain. You're describing "scybalous stool" & sense of incomplete evacuation, so mucus may also be produced due to partial obstruction, chronic constipation, rectal dysfunction, infection, & even from secretory villous rectal tumors. No bleeding, weight loss, fever, tenderness...Right? Call your doc to get checked.

It depends: With your age and symptoms, you could have a number of causes, but inflammatory bowel disease (ibd) could be a cause. Without knowing more, i would seek a gastroenterologist opinion who will ask you more about your symptoms and history and possibly run some diagnostic testing to determine if it is ibd.