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Armpit lump

Lump in the armpit; Localized lymphadenopathy - armpit; Axillary lymphadenopathy; Axillary lymph enlargement; Lymph nodes enlargement - axillary; Axillary abscess

An armpit lump is a swelling or bump under the arm. A lump in the armpit can have many causes. These include swollen lymph nodes, infections, or cysts.

Causes

Lumps in the armpit may have many causes.

Lymph nodes act as filters that can catch germs or cancerous tumor cells. When they do, lymph nodes increase in size and are easily felt. Reasons lymph nodes in the armpit area may be enlarged are:

Cysts or abscesses under the skin may also produce large, painful lumps in the armpit. These may be caused by shaving or use of antiperspirants (not deodorants). This is most often seen in teens just beginning to shave.

Other causes of armpit lumps may include:

  • Cat scratch disease
  • Lipomas (harmless fatty growths)
  • Use of certain medicines or vaccinations

Home Care

Home care depends on the reason for the lump. Check with your health care provider to determine the cause.

When to Contact a Medical Professional

An armpit lump in a woman may be a sign of breast cancer, and it should be checked by a provider right away.

Contact your provider if you have an unexplained armpit lump. Do not try to diagnose lumps by yourself.

What to Expect at Your Office Visit

Your provider will examine you and gently press on the nodes. You will be asked questions about your medical history and symptoms, such as:

  • When did you first notice the lump? Has the lump changed?
  • Are you breastfeeding?
  • Is there anything that makes the lump worse?
  • Is the lump painful?
  • Do you have any other symptoms?

You may need more tests, depending on the results of your physical exam.

References

Miyake KK, Ikeda DM. Mammographic and ultrasound analysis of breast masses. In: Ikeda DM, Miyake KK, eds. Breast Imaging: The Requisites. 3rd ed. St Louis, MO: Elsevier; 2017:chap 4.

Tower RL, Camitta BM. Lymphadenopathy. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier;2020:chap 517.

Winter JN. Approach to the patient with lymphadenopathy and splenomegaly. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 154.

Text only

  • Female Breast - illustration

    The female breast is either of two mammary glands (organs of milk secretion) on the chest.

    Female Breast

    illustration

  • Lymphatic system - illustration

    The lymphatic system filters fluid from around cells. It is an important part of the immune system. When people refer to swollen glands in the neck, they are usually referring to swollen lymph nodes. Common areas where lymph nodes can be easily felt, especially if they are enlarged, are the groin, armpits (axilla), above the clavicle (supraclavicular), in the neck (cervical), and the back of the head just above hairline (occipital).

    Lymphatic system

    illustration

  • Swollen lymph nodes under arm - illustration

    Lymph nodes can become swollen as an immune response to local infection.

    Swollen lymph nodes under arm

    illustration

  • Female Breast - illustration

    The female breast is either of two mammary glands (organs of milk secretion) on the chest.

    Female Breast

    illustration

  • Lymphatic system - illustration

    The lymphatic system filters fluid from around cells. It is an important part of the immune system. When people refer to swollen glands in the neck, they are usually referring to swollen lymph nodes. Common areas where lymph nodes can be easily felt, especially if they are enlarged, are the groin, armpits (axilla), above the clavicle (supraclavicular), in the neck (cervical), and the back of the head just above hairline (occipital).

    Lymphatic system

    illustration

  • Swollen lymph nodes under arm - illustration

    Lymph nodes can become swollen as an immune response to local infection.

    Swollen lymph nodes under arm

    illustration


 

Review Date: 7/8/2023

Reviewed By: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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