There is no swelling or extreme pain. but there is bleeding during strained bowel movement. could this be internal hemorrhoids?

Yes: Rectal bleeding may be caused by hemorrhoids. Colonoscopy is the standard of care to evaluate rectal bleeding in people over 40.

Could: Be internal hemorrhoids as they usually are associated with painless bleeding, could also be a chronic fissure which may alos bleed painlessly. More importantly one should determine the reason for having to strain to have bm. Probably best to get checked by a GI doctor or a colorectal surgeon.