Lymphedema is a swelling of the body. The swelling is because the fluid in the body called the lymph is difficult to transport and instead accumulates in one place. The treatment is to reduce the swelling and to prevent the size of the lymph nodes.
The lymphatic system is important for the body to defend itself against various infections. Here you can read more about diseases and disorders of the lymphatic system such as swollen lymph nodes and lymphedema.
It is common for children and adults to have swollen lymph nodes. Then they are often tender and bigger than they usually are. For example, it may be due to a viral infection in a cold, a bacterial infection in the throat, or a wound that is infected. If you have swollen lymph glands larger than two centimeters, they should be examined by a doctor.