Armpit Lumps Causes, Treatments & More

By leslie
Reviewed: dr. vanta
Article Sources Article Sources
  • 1. 'Swollen Lymph Nodes.' Mayo Clinic.
  • 2. ‘''Armpit Lump.' Mount Sinai.
  • 3. 'Should I Worry About a Lump Under the Armpit?' Dana-Farber Cancer Institute. 9 Jul 2020.
  • 4. 'Armpit Lump.' University of Florida Health. www.
  • 5. 'Hidradenitis suppurativa.' Mayo Clinic. www.
Medical Expert Medical Expert

Finding one or more armpit lumps can be frightening. Depending on the symptoms and the lumps' appearance and feel, they can be minor annoyances or more serious. If they don't go away on their own, a visit to the doctor is the best move.

Swollen lymph nodes cause most armpit lumps. These nodes are part of the lymphatic system, which acts as a filter, removing debris from infection and inflammation. If there's an infection nearby, such as in a breast or arm, lymph nodes under the arm may swell and become tender. Cancerous cells in a lymph node also may cause armpit lumps.1‘Swollen Lymph Nodes.’ Mayo Clinic.,2‘’‘Armpit Lump.’ Mount Sinai.

1. Causes of Armpit Lumps

The axillary lymph nodes in the armpit help remove damaged cells, microbes and dead tissue. Armpit lumps usually arise because of an infection, which may be localized near the armpit or can involve the entire body. Infections that cause armpit lumps are generally in the arm or breast.

Lumps under the arm can also be the result of inflammatory diseases, such as lupus and rheumatoid arthritis, or cancer. Viral diseases like mono, herpes and HIV may also cause swollen lymph nodes. Armpit lumps that are unrelated to the lymph nodes may be caused by cysts, fatty benign tumors or from the use of antiperspirants.1‘Swollen Lymph Nodes.’ Mayo Clinic.

Armpit Lumps

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