Noticing swelling in the armpit may cause concern, especially in terms of breast health. However, not every swelling felt in the armpit is a sign of breast cancer. Enlarged lymph nodes, infections, hair follicle inflammation, lipomas, subcutaneous cysts or some recent illnesses may cause a lump in the armpit or a feeling of hardness.
Nevertheless, newly developed armpit swellings that do not go away for a long time, gradually grow, feel hard and are painless should be taken seriously. Especially if there is a breast lump, nipple discharge, pulling of the breast skin, change in breast shape or a prominent one-sided hardness in the armpit, breast surgery evaluation should not be delayed.
What Does Swelling in the Armpit Mean?
Swelling in the armpit can be described as a lump, hardness, fullness or a raised area felt under the skin in this region. The armpit area contains lymph nodes, fatty tissue, sweat glands, hair follicles and subcutaneous tissues. Therefore, the cause of swelling may not be related only to breast tissue.
Lymph nodes are part of the body’s defense system. When infection, inflammation or an immune response develops, armpit lymph nodes may become enlarged. Sometimes a simple skin infection, irritation after shaving, hair follicle inflammation or recent viral illnesses may also cause armpit swelling.
However, if the swelling persists for a long time, is one-sided, feels hard or occurs together with different findings in the breast, a more detailed evaluation is required.
Can Swelling in the Armpit Be Related to Breast Cancer?
Swelling in the armpit may be related to breast cancer in some cases. Since lymphatic drainage from the breast tissue reaches the lymph nodes in the armpit, breast cancer may cause enlargement of the armpit lymph nodes in some patients. For this reason, hardness felt in the armpit should not be considered completely insignificant.
Armpit swellings that may be associated with breast cancer are usually one-sided, hard, painless, gradually growing and not easily movable. This may be accompanied by a palpable breast lump, nipple retraction, bloody discharge, dimpling of the breast skin or skin thickening.
The presence of these findings does not definitely mean cancer. However, to understand the underlying cause, breast examination, armpit evaluation and the necessary imaging methods should be planned together.
Which Armpit Swellings Should Be Taken Seriously?
Armpit swellings that disappear in a short time, are painful and related to infection may often develop due to benign causes. On the other hand, some swellings should be examined more carefully. Examination is especially important for armpit swellings that last longer than two weeks, gradually grow, become harder or remain one-sided.
Painless swellings should also not be ignored. This is because pain may not be present at the beginning of some serious breast diseases. Not feeling pain does not mean that the lump in the armpit is insignificant.
If the following findings are present, evaluation should not be delayed:
| Finding That Should Be Considered | What Could It Mean? |
|---|---|
| One-sided armpit swelling | A condition related to the breast tissue or lymph nodes should be investigated. |
| Hard and immobile lump | It may require a more detailed examination and imaging. |
| Painless but growing swelling | It should be taken seriously and its cause should be clarified. |
| Swelling together with a breast lump | It requires evaluation by a breast surgeon. |
| Bloody discharge from the nipple | It should be examined in terms of breast diseases. |
| Pulling or thickening of the breast skin | Conditions that may be a sign of breast cancer should be ruled out. |
| Long-lasting hardness in the armpit | Direct evaluation is more appropriate than waiting for follow-up. |
Is Painless Swelling in the Armpit Dangerous?
Painless swelling in the armpit is a finding that should be considered. Pain is usually more noticeable in infections, inflammation or hair follicle problems. However, the absence of pain does not mean that the swelling is insignificant.
Lymph node enlargements related to breast cancer may be painless in some patients. Therefore, especially hard, one-sided, growing and long-lasting painless armpit swellings should be evaluated. At the same time, if there is a breast lump, nipple change or pulling of the skin, waiting is not appropriate.
In painless swellings, it is not correct for a person to diagnose themselves. Through examination and imaging, it can be understood whether the swelling is related to a lymph node, lipoma, cyst, infection or a breast-related condition.
What Should Be Done If Swelling in the Armpit and a Breast Lump Are Seen Together?
If swelling in the armpit and a breast lump are noticed together, evaluation should not be delayed. The presence of these two findings together requires the breast tissue and armpit lymph nodes to be examined as part of the same process.
In this case, first a breast examination is performed. The location, size, consistency, mobility and relationship of the lump with the skin are evaluated. Whether the swelling in the armpit is a lymph node, as well as its size and structure, is also examined during the physical examination.
Then, according to age and findings, breast ultrasound, mammography or, if necessary, biopsy may be planned. Recommendation of a biopsy does not directly mean cancer; the aim is to clarify the structure of suspicious tissue and create the right treatment plan.
What Causes Armpit Lymph Node Enlargement?
Armpit lymph node enlargement may occur for many different reasons. Infections, skin irritation, hair follicle inflammation, wounds on the arm or hand, some viral illnesses and conditions that stimulate the immune system may cause enlargement of the lymph nodes.
In women, diseases related to breast tissue may also affect the armpit lymph nodes. Therefore, an enlarged lymph node in the armpit should be evaluated not only based on its location, but also together with the breast tissue and surrounding structures.
Painful, soft and short-term lymph node enlargement may be related to infection. However, hard, painless, gradually growing and long-lasting armpit lymph nodes require a more detailed examination.
How Is the Diagnosis of Swelling in the Armpit Evaluated?
When evaluating the diagnosis of swelling in the armpit, a physical examination is performed first. It is determined whether the swelling originates from the skin, is related to a lymph node, comes from fatty tissue or is connected to breast diseases. The size, consistency, mobility, whether it is painful and how long it has been present are important.
When necessary, armpit ultrasound and breast ultrasound may be requested. Depending on age and risk status, mammography may also be added to the evaluation. Imaging helps clarify the structure of the swelling more clearly.
If suspicious features are present, a biopsy may be performed. This procedure allows a tissue sample to be taken to clarify the diagnosis. The biopsy decision is important for understanding the type of disease and determining whether treatment is necessary.
Can Swelling in the Armpit Go Away on Its Own?
Swelling in the armpit may go away on its own in some cases. Swellings that develop due to causes such as infection, irritation or hair follicle inflammation may decrease with appropriate care and treatment. However, it is not correct to assume that every swelling will go away this way.
If the swelling does not shrink in a short time, continues to grow, becomes harder or remains permanently painless, evaluation is required. Especially if there is a breast lump or changes in the breast skin, examination should be performed instead of waiting.
Squeezing the armpit swelling, trying to disperse it with massage or waiting for it to go away with home remedies may delay diagnosis. The correct approach is to determine the cause of the swelling and plan follow-up or treatment accordingly.
When Should You See a Doctor for Swelling in the Armpit?
If swelling in the armpit lasts longer than two weeks, gradually grows, is one-sided or feels hard, a doctor should be consulted. Evaluation should also not be neglected in painless swellings.
If there is a palpable breast lump, nipple discharge, nipple retraction, dimpling of the breast skin, redness, wound or prominent hardness in the armpit, medical consultation should not be delayed. The cause of these findings may be benign; however, conditions that may be a sign of breast cancer should be ruled out.
Newly developed armpit swellings should be evaluated more carefully in people who have previously been diagnosed with breast disease or who have a family history of breast cancer.
