Can prolonged sitting on a toilet everyday reading exert enough pressure to cause hemorrhoids or anything else long term?

Sitting on toilet. Sitting on the toilet for prolonged period of time waiting for a bowel movement is like putting a tourniquet around your hemorrhoids, so they engorge with blood and then become symptomaticc when passing the stool. For the same reason i discourage sitting on those inflatable donuts when you have rectal pain. Use a broad surfaced bed pillow rather than the donut if needed. Indeed if your are constip.
NO. Should not unless you have chronic constipation for which you are sitting on the toilet for long period.