Lumps in the Armpit: Signs of Tumors or Hormonal Changes?

There is a hard lump in the armpit?

It was first noticed about 2.3 months ago while showering, when a lump was felt under the skin in the right armpit (not like a pimple that protrudes on the surface).
It is painful when pressed or touched, and there is some discomfort when showering.
Upon further observation, it was noted that a week before the menstrual period, the breast becomes swollen, accompanied by swelling and pain in the armpit lump and the surrounding area.
Compared to the other armpit, the right side is noticeably more swollen.
After the menstrual period, the lump and surrounding area become less painful, but compared to the other armpit, it still appears swollen.
Could this possibly be a tumor?

Ms. Chen, 30~39 year old female. Ask Date: 2021/08/15

Dr. Chen Sirong reply Oncology

Ms.
Chen / 31 years old / Female If the changes are related to menstrual cycle irregularities, it should be fine.
Mammography is recommended to start at age 45, and for those with a family history, it is advised to begin screening at age 40.
Of course, there are clinical cases of breast disease occurring in individuals in their 30s.
Currently, it is recommended to undergo screening if there are any abnormalities.
Wishing you good health.
Taoyuan Hospital, Dr.
Chen Si-Rong.

Reply Date: 2021/08/15

More Info

When you discover a lump in your armpit, especially one that is painful and seems to fluctuate in size or tenderness with your menstrual cycle, it can understandably cause concern. The symptoms you describe—pain, swelling, and a lump that feels different from a typical pimple—warrant further investigation, but they do not necessarily indicate a tumor.

Lumps in the armpit can arise from various causes, including hormonal changes, infections, or benign growths. Given that you mentioned the lump's tenderness correlates with your menstrual cycle, it is possible that hormonal fluctuations are influencing the swelling. Hormones like estrogen and progesterone can cause breast and surrounding tissue to swell, which might also affect lymph nodes in the armpit, leading to temporary enlargement and discomfort.

One common cause of lumps in the armpit is lymphadenopathy, which is the enlargement of lymph nodes. This can occur due to infections (like a viral or bacterial infection), inflammatory conditions, or even benign tumors such as lipomas (fatty tumors). If the lump is painful and associated with other symptoms like fever or redness, it could suggest an infection, which might require treatment.

On the other hand, if the lump persists, grows larger, or changes in character (for example, becoming hard or immobile), it is essential to seek medical evaluation. While most lumps are benign, some can be indicative of more serious conditions, including tumors. In particular, breast cancer can sometimes present with lymph node involvement in the armpit, especially if there is a lump in the breast itself. However, the absence of other concerning signs, such as a hard, fixed mass or significant changes in breast tissue, can be reassuring.

To assess the lump accurately, a healthcare provider may recommend imaging studies, such as an ultrasound or mammogram, to evaluate the characteristics of the lump and surrounding tissues. In some cases, a biopsy may be necessary to determine the nature of the lump definitively.

In summary, while the lump you described could be related to hormonal changes, it is crucial to monitor it closely and consult with a healthcare professional for a thorough evaluation. They can provide guidance on whether further testing is needed based on the lump's characteristics and your overall health. Remember, early evaluation and diagnosis are key to addressing any potential issues effectively.

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