Is it normal for the thyroid to swell when my immune system is being taxed? The swelling is just below the chin in the neck area (center), it almost looks like a mild second chin. It is a little sore when this happens. But once I've gotten my health back in control it stops being sore. Should I be concerned? Go to the doctor? I would rather do something healthy at home if possible. This has been happening for many years with no serious problems but I am 44 and don't want it to be cancer or something at my age, would be harder to deal with!