Having diarrhea pains in stomach and when using the bathroom to wipe there is brown mucus on the tissue what could this means?

Gastroenteritis: You are reporting classic symptoms for gastroenteritis or 'the runs'. Basically your GI tract is trying to 'spit out' whatever is making you sick- so it's dumping, dumping, dumping the contents... that includes liquidy stools, the mucous that's in there anyway, plus possibly some inflammation from the bacteria/germ, and the germs themselves. Getting the germs out is what the body is trying to do.