Which is the main symptom of rectal/colon cancer? constipate or diarrhea? or both? i got a constipation fir 4 months already but no diarrhea

Either: Rectal and colon cancer could be very serious and should not been taking lightly you are 25 years old chance of cancer very low but not zero you simply have a bad constipation you should not let yourself go for four month without proper treatment eat more healthy food less junk eat more fruits and fibers drink a lot of water and take stool softener if you need it see your doctor if not better.