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Lymph glands are normally pea-sized. You can sometimes feel them as lumps under the skin. People often feel their lymph glands in the neck. Lymph glands under the skin become more noticeable and easier to feel if they swell. They can swell to the size of marbles or even bigger.

You cannot see or feel lymph glands deeper in the chest or tummy (abdomen) if they swell.

Causes of swollen lymph glands include the following:

Infection - the common cause

The lymph glands near to an infection swell quickly and become tender as the immune system 'fights off' infecting germs (bacteria, viruses, etc). The lymph glands usually go back to their normal pea size when the infection is over. It can take a week or so for them gradually to go back to normal after the infection. Examples include the following:

Throat infections, tonsillitis, the common cold and tooth-related infections may cause lymph glands in the neck to swell.
Scalp skin conditions or even head lice may cause the lymph glands at the back of the head to swell.
Skin infections of the arm may cause lymph glands in the armpit to swell.
Infections of the leg or genitals, or nappy rash, may cause lymph glands in the groin to swell.
Viral infections such as flu (influenza), chickenpox or glandular fever (infectious mononucleosis) affect the whole body. You may then develop swollen lymph glands in various parts of the body such as the neck, armpit and groins.

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