im 24 years old .... I don't suffer from any type of weight loss or pain but here lately ive been noticing blood on the toilet paper after wiping bright red blood sometimes it can be on the stool but just on top of it ive noticed that if its a loose stool then there is no blood but if its a hard stool the bigger it is the blood there is there isn't any pain and this has been going on off and on for quit some time sometimes I can go weeks without seeing any blood I don't have any hemmroids that I can see maybe there inside me I don't no and I have been suffering from constipation a lot lately I ussaly will go 2-3 days with no bowl movements at all then out of know where have like 4 or 5 of them in the same day what could this be ive been reading on here that cancer is a possibility