Can an anal fissure or hemorrhoids cause swollen lymph nodes in the groin?

Yes, but not often

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Any inflammatory lesion can cause local lymph node enlargement However, enlarged nodes in the groin are not commonly associated with these perianal problems. See a surgeon They can assess and treat the perianal problems and evaluate the nodes
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Anal fissure Anal swelling Anus Enlarged lymph nodes Fissure Groin Hemorrhoids Local Swollen glands Wounds

No

Enlarged_lymph_nodes
No, generally not. A peri rectal abscess or fistula might, but there are many non-anal possibilities. See your primary care physician.
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Abscess Anal fissure Anal swelling Anus Enlarged lymph nodes Fissure Fistula Groin Hemorrhoids Rectal abscess