All I can say is 'put up with it' though. My old man died of colon cancer at 58. He left things far too long as he thought it was piles -so bad the bleeding to the point he had to borrow my mother's sanitary towels. I came back from France and advised him, only son to father, to go and see one of his Rotary mates if he was too embarrassed to see his GP - he did - and was operated on within 10 days.
Initially, they gave him less than 2 weeks when they went in but once the material was centrifuged and tested, this went back. 5 months later, the parental units came out to visit me in Paris and he was in rude health - three years respite and then it was back, spreading south and taking its time to nail him. If it had gone upwards into his kidneys/liver etc, it would have been far, far quicker.
Get tested....however uncomfortable.