If your last colonoscopy found hemorrhoids, I think that would probably be a likely cause of bright red blood. Were they internal hemorrhoids? If so, it can be completely painless. But given that you had recent hernia repair surgery, I would suggest you speak to your surgeon just in case it is related to that.
Male, 33 @ dx, stage 1 RC (T1N0M0 0/29 LNs)
2016-02 - Cancerous polyp removed during colonscopy, 0.5 mm margin
2016-03 - ULAR & TME surgery, temp ileostomy
2016-04 - DVT, pulmonary embolism
2016-11 - Ileostomy reversal
2018-10 - Another DVT & PE
Clean CTs 2016-08, 2017-03, 2017-09, 2018-04, 2018-09