I've had a swollen lymph node in my neck for a year, but now have swollen ones in my knee and palate. why? labs were normal 9 months ago.

Lots of explanations: Reasons for enlarged lymph nodes are many. Some benign, some serious. Could be viral, allergies, infections, cancers, ect. I would recommend getting one biopsied since they have been persistent for so long and now you have more. See your doctor or a surgeon.

Not Sure: Swollen lymph glands that stay enlarged are always a concern. There are many possible causes, some serious like cancer, some less serious, like a chronic infection, and some not so serious, like allergies. You need to get this checked out. Lab tests alone may not reveal a problem. Sometimes a biopsy of the node may be necessary. Don't wait, get seen by your doctor.