Swollen cervical lymph nodes for 5 month now havnt shrunk or grew normal cbc doctors not worried does it mean cancer?

Swollen Nodes : Are the nodes tender? Or "rock hard!" at your age, multiple swollen lymph nodes generally mean an underlying infection, like chronic sinusitis, scalp infection, or a generalized infectious disorder, although with a normal cbc, that is less likely. Any other symptoms? Nasal congestion? Sinus pressure? Headaches? Itchy scalp or rash on head? I would make an appointment with an ENT specialist.

FOLLOW UP REQUIRED: Swollen lymph nodes may mean significant problems, but the majority of time this may simply be the result of a viral infection. Mononucleosis results in prolonged swollen lymph nodes. Your physician should be evaluating this ongoing problem; possibly further testing in order.

Not likely: Lymph nodes in the neck enlarge for lots of reasons. Often it's infection, sometimes immunizations. If they're small (< 1/2") they may just be scarred from a previous infection. Cancer may grow slowly , but typically if they were cancerous nodes they would have clearly enlarged over 5 months with no treatment.