Your lymph nodes get larger when more blood cells come to fight off an invading infection. They all essentially pile in, causing pressure and swelling. Often, the lymph nodes that swell will be close to the infection's site. (That means a person with strep throat might develop swollen lymph nodes in their neck.)

How do lymph nodes get enlarged?

Swollen lymph nodes usually occur as a result of infection from bacteria or viruses. Rarely, swollen lymph nodes are caused by cancer. Your lymph nodes, also called lymph glands, play a vital role in your body's ability to fight off infections.

How do swollen lymph nodes feel?

People can check whether their lymph nodes are swollen by gently pressing around the area, such as the side of the neck. Swollen lymph nodes will feel like soft, round bumps, and they may be the size of a pea or a grape. They might be tender to the touch, which indicates inflammation.