can gonorrhea cause swollen lymph nodes
Not likely. Most swollen or inflamed lymph nodes in the groin are not due to STDs, and gonorrhea and chlamydia don't do this. (There is a special kind of chlamydia called lymphogranuloma venereum or LGV, which causes this kind of problem, but extremely rare and almost never in heterosexuals.) If you're at risk for STDs, get checked for gonorrhea or chlamydia -- but not because of lymph nodes in the groin.