Lymph nodes on neck still slightly swollen 3 weeks after flu. gp says no cause for concern. is this normal?

For a long time: After an illness that produces swollen lymph nodes the nodes can stay somewhat swollen and tender for a long time, even weeks. Sometimes a slight swelling can remain forever! That being said, the general trend week to week should be one of improvement, smaller size and less pain. If this does not occur you should follow-up with your doctor.

Yes, but...: After the flu, lymph nodes may remain swollen for several weeks, though usually we tell patients that after 2-3 weeks, the lymph nodes should start to go down. Now, that depends on the particular patient, the severity of the infection, the size of the neck, etc. So, don't worry too much. However, 1 month after resolution of all flu symptoms, your nodes should be smaller. If not, get checked out.