I'm 21, female. for a few months now i have had issues defecating. now it feels like my colon is full and is uncomfortable. i have no appetite and my stomach has been hurting from time to time. i'm terrified i have bowel cancer.

No known illness?: Each person with constipation needs to be sure there is no other disease causing it. If constipation is just due to slow movement of the food and poop through the gut, then the things to try are vegetables, water, prune juice, prunes, fiber-with-water, polyethylene glycol, Senokot or other senna, milk of magnesia, other laxatives... A doctor can evaluate and maybe prescribe helpful medicines too.