Im straining to push poop out,& afterward say nothing comes out but i feel lower back pain & some random stomach pain like pokes or pinches why is that?im not constipated because i went to toliet in morning.i do see mucus and gets cramps. no blood?

Constipation: At your age, without other symptoms, it seems this is constipation related. Increase fluid to 8, 8oz glasses of water daily. Take 2 tablespoons full of miralax in 8oz water/juice daily. For a few days, take 2 x 5mg dulcolax daily then see if miralax alone is satisfactory. Add fiber foods to your diet or supplement with Metamucil or citrucel if needed.review any meds you take for GI effects.