Is it possible that there may be internal hemorrhoids that cause bleed during defecation?

Yes. That is commonly the cause but other causes should be envaulted so discuss with your doctor.
Yes. Hemorhhoids can ceratainly cause bleeding during defecation. But many other things cause rectal bleeding, as well. Some are serious (like colorectal/anal cancer) and benefit from early diagnosis. Others, like anal fissure, are not so serious, but benefit from treatment. See your doctor - don't self diagnose!

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