Unexplained Lump in Armpit: Could It Be a Sign of Breast Cancer? - Breast and Thyroid

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Unexplained lump in the armpit?


I would like to ask about a recent issue where I have been experiencing pain in my left armpit while wearing a bra.
Initially, I thought it was due to the bra being too small, but later I discovered an unknown lump.
Could this be a symptom of breast cancer?

Hǎitún, 20~29 year old female. Ask Date: 2006/08/09

Dr. Yang Mingqi reply Breast and Thyroid


Hello, internet user: If you feel any unexplained lumps in your breast or underarm, please seek a diagnosis from a general surgeon or a breast surgeon as soon as possible.
Do not take it lightly or attempt to self-diagnose.
Sincerely, Dr.
Yang Ming-Chi, Surgeon.

Reply Date: 2006/08/09

More Info


When it comes to unexplained lumps in the armpit, it is essential to approach the situation with caution and awareness of the potential implications. While it is understandable to be concerned about the possibility of breast cancer, especially given your recent symptoms, it is important to consider several factors before jumping to conclusions.

Firstly, the presence of a lump in the armpit can be attributed to various causes, and not all of them are related to breast cancer. Lymph nodes are located in the armpit area, and they can become swollen or tender due to infections, inflammation, or other benign conditions. For instance, conditions such as a localized infection, a reaction to a vaccine, or even a skin condition can lead to swelling in the lymph nodes. Additionally, benign cysts or lipomas (fatty tumors) can also present as lumps in this area.

Breast cancer can indeed cause lymph nodes in the armpit to swell, particularly if the cancer has spread (metastasized) from the breast tissue. However, it is crucial to note that not all swollen lymph nodes indicate cancer. In fact, the majority of cases are due to non-cancerous causes. The key symptoms of breast cancer often include changes in the breast itself, such as a new lump in the breast, changes in breast shape or size, skin changes, or unusual discharge from the nipple.

Regarding your specific situation, the pain you are experiencing in your left armpit, combined with the discovery of a lump, warrants further evaluation. It is advisable to consult with a healthcare professional who can perform a thorough examination and may recommend imaging studies, such as an ultrasound or mammogram, to assess the nature of the lump. In some cases, a biopsy may be necessary to determine whether the lump is benign or malignant.

It is also worth noting that breast cancer symptoms do not always persist or present in a straightforward manner. Some individuals may experience intermittent symptoms, while others may have more consistent signs. The presence of pain or discomfort in the breast or armpit area can be due to various factors, including hormonal changes, muscle strain, or other benign conditions.

In conclusion, while the discovery of a lump in the armpit can be concerning, it is essential to approach the situation with a balanced perspective. Many factors can contribute to the development of lumps in this area, and not all are indicative of breast cancer. Seeking medical advice is crucial for proper diagnosis and management. Regular check-ups and screenings, especially if you have a family history of breast cancer or other risk factors, are vital for early detection and peace of mind. Remember, early intervention is key in addressing any health concerns effectively.

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