 [ Symptoms ] permanent swollen lymph nodes after mononucleosis is something wrong  about a year ago i had mono and my lymph nodes in my neck and groin swelled as is common but even now close to a year later they are still rock hard i can not seem to find this problem anywhere online [ Disease ] lymph node enlargement especially from mono can persist some lymph nodes harden over time and can last a long long time with that said since i have no way of examining you running diagnostic tests or delving into your medical history i would suggest that you see your medical provider to be properly evaluated there can be many other reasons for lymph node enlargements