Swollen Glands: Checkpoints in Your Neck
When you have a sore throat, the doctor often presses gently along the sides of your neck. Under your skin there are small, bean-shaped lumps called lymph nodes. People sometimes call them glands. Most of the time you cannot feel them at all.
Your body has a network of thin tubes that carry a clear fluid called lymph. The tubes run through the body, and lymph nodes sit along them like checkpoints on a road. You have clusters of nodes in your neck, under your arms, and in other places too. As lymph flows through a node, the node filters it. Germs and other unwanted bits get caught there.
Nodes are also packed with white blood cells, which are the fighters of your immune system. When a germ gets caught, the white blood cells in the node spring into action. The node makes more of them, and this extra crowd makes the node swell up. A swollen node may feel tender, like a small, soft marble under the skin.
That swelling is a sign that your body is working hard. When the sickness is gone, the nodes slowly shrink back to their normal size. If a node stays big for a long time, a doctor will want to take a look. Swollen glands are not a problem in themselves. They are a message that your defenses are busy.