My 9-year-old son has had a swollen lymph node in his neck for four months. All his blood tests came back normal. It does go up and down in size. Doctors and surgeons say it is just a swollen ...

If your child has a lymph node that’s swollen to more than that size ... and can become swollen if you have an infection in ...

Swollen lymph nodes in your neck, armpit, head ... or unexplained weight loss In children, any lymph node larger than about 1 ...

However, very occasionally, swollen lymph nodes can be a sign of inflammation deeper inside the body, or more rarely, a sign of cancer, but in this case they are usually much larger than a pea.