can bulimia cause swollen lymph nodes under the jaw? I am a 20 year old girl, I have a swollen lymph node under my jaw on the left side. I have absolutely no other symptoms anywhere else on my body no sore throat, sores, a cold, or anything else. Also, I read that swollen lymph nodes could be a sign of an std. I recently had protected sex (condom) on the 14th of january as well as unprotected oral sex. Could this be a sign of that? I have so symptoms of an std or anything else abnormal besides the swelling. Or is the swelling the result of my increased purging? I am very scared.