Lymph nodes that spread throughout the body, including the neck and stomach, are a vital part of the body's immune system as they help fight infection. However, sometimes the lymph nodes themselves are surrounded by infection. In this case, they may swell and become tender.

What is the reason of this?

Swollen lymph nodes are most often caused by an infection – the source may be something as simple as a cold or a more serious infection depending on what other symptoms go with them. Lymph nodes swell as they try to fight the infection.

Tips

Swollen lymph nodes caused by something like a cold or flu are usually nothing to worry about, but determining the cause can be difficult. Therefore, it's a good idea to let your healthcare provider know about the swollen lymph node so they can treat you as they see fit.