For over 10 years I have had this problem. On the right side of my neck close to my throat a knot pops out, which prevents me from swallowing.. I have to physically pop it back in, which hurts a lot. As time has progressed it has gotten harder to push in. Finally, went to an ENT doctor who says I am a medical mystery. I have had an ultrasound, ct with contrast, and waiting on results from ultrasound guided biopsy. My first two test have shown that my lymph nodes are extremely large.