Lump Under Armpit in Women and Men: Signs, Causes, and Imaging Options
Reviewed By: John Duncan, Ph.D.
Director of Operations at: VIASCAN
Finding a lump under your armpit can feel alarming, and yet most of the time it is explainable and usually not serious at all. So if you spotted a small lump sort of low in the armpit, or you noticed a larger one that appeared more suddenly, you will probably want to figure out what it might be, and then decide when it is smart to see your doctor. Below is a loose overview of the most typical causes, the warning signs, and how healthcare professionals can help you with different imaging options that are available for a lump under the armpit.
What is the most common reason for a lump under the armpit in both women and men?
Lymph nodes, those little glands that help your immune system, live in the armpit area. These nodes swell in response to an infection, inflammation, and any changes within the body. A lump under the armpit in females, or a lump under the armpit in males, is often about the same kind of causes, and most of the time it is not malignant or anything cancer-like.
infections, enlarged lymph nodes, and a few other health issues
- A smaller bump in the armpit is most frequently tied to swollen lymph nodes. That can happen when your immune system is busy dealing with something, like a cold, the flu, a skin infection, or even a seemingly “minor” cut on the arm. In these situations, the lump will often fade on its own once the infection clears, and the swelling goes down.
- Another fairly common idea is ingrown hairs or skin irritations, especially in places that get shaved. You may see a small red bump that seems to sit just near the skin’s surface. This can appear in both sexes, and it generally calms down with time if you stick to gentle skincare and try not to keep rubbing the area.
- In the softer tissue of the armpit, it can happen that there are non-cancerous lumps, like cysts, or sometimes lipomas. A cyst is a sac filled with fluid, and a lipoma is a slow-growing mass of fat. Both are soft and movable and are usually not painful.
- The swelling of the lymph nodes around the armpit can be temporary and it comes from an allergic reaction or from the body’s response to a vaccination, sort of like a delayed kind of signal. This is pretty well documented after certain shots given in the upper arm, and it usually calms down within a few weeks.
When is a lump in the armpit more concerning?
Most armpit lumps are generally harmless, but there are signs that sorta point you should not sit around and wait for things to “settle.” There are a few clues; if you recognize them can help you decide when it’s worth getting checked, not just hoping it fades. For example, if you notice a big bump under the armpit, or if it stays put for a long time without any movement, there are a few features to pay attention to.
Signs of trouble requiring medical care.
- If the lump is firm, sessile (unmoving) and increasing in size then it should be seen by a doctor.
- Benign lumps are soft and move slightly when touched. If the lump is hard and feels immovable and it seems to be growing larger over time, medical evaluation is recommended.
- Any lumps that come with symptoms that are unexplained, like a loss in weight, night sweats, constant tiredness, or fever, should be discussed with a health care provider.
- When combined with a little lump under the armpit in females or males, these systemic symptoms can be a sign that the lymph nodes are reacting to something that needs an investigation.
- If a lump does not go away in 2-4 weeks, it should not be ignored. Swelling of the lymph nodes due to infection will go away when the infection is cured.
- If a lump has not gone away in a month for a known reason, it is something that should be assessed by a professional.
Are Swollen Lymph Nodes Under the Armpit connected to cancer?
Yes, sometimes, swollen lymph nodes under the armpit are related to some types of cancer, such as breast cancer. Cancer cells that spread to the underarm lymph nodes can form a breast cancer lump under the armpit. Most lumps in the armpit area, however, are not associated with cancer. If any lump is detected in the imaging report, it should be examined and tested by a healthcare provider to determine the cause of the lump.
| Benign Causes: | Potentially Serious Causes |
| Swollen lymph nodes because of an infection | Persistent lymph node enlargement, especially if there is no infection around Hard , immovable, quickly growing lump Lymphoma or other lymphatic conditions |
| Ingrown hair or folliculitis, that kind of irritated bump Lipoma, a fatty tissue growth, softish and slow | A lump linked with unexplained weight loss or fever |
| A cyst from a blocked gland often feels smooth or slow-moving | Vaccine-related swelling can happen, but unusual persistence should be checked. |
| An allergic reaction can also swell areas, but it typically comes with other symptoms and fades | Metastatic cancer that affects the lymph nodes |
How do health care providers determine the cause of armpit lumps?
When you visit your doctor about a lump under your armpit, either a small lump under armpit that’s been there for weeks or a large lump under your armpit that you noticed recently your doctor will go through the evaluation process. The goal is to better understand the possible cause of the lump and determine whether additional testing is needed. Your health provider will answer all your concerns about why do I have a lump under my armpit.
Physical Exam and Med Evaluation
- Often, an initial physical examination is the first step. Your doctor will examine the lump to check whether it is movable, hard or tender, and will ask you about any recent infections or illnesses, vaccinations, and when the lump appeared. A physical examination helps physicians evaluate the characteristics of the lump and possible underlying causes.
- Imaging tests may be suggested if a lump is not adequately investigated by physical examination. A computed tomography (CT) scan can help doctors find out the size and appearance of the lymph nodes and nearby tissue. Las Colinas’ ViaScan provides non-invasive CT scan and whole-body scan services, which can complement a physician’s wider health evaluation process and offer further insights on imaging that could assist in determining next steps in a person’s healthcare.
If a physician suspects that any imaging or physical tests are useful to pursue, a biopsy or blood test may be ordered. The tests are conducted by specialist medical providers and are used to further detail the cause of persistent or problematic lumps.
Choose Our Wellness Body Scan
Early Detection Saves Lives!
-
- Accurate
- Quick Result
- Affordable
Conclusion
Whether you’re dealing with a lump under the armpit in a woman, or a lump under the armpit in a man, the biggest thing is not to just brush it off, ok. Most lumps end up being benign, a healthcare professional can properly evaluate the cause. is to get a proper medical evaluation. If that lump has hung around for more than a few weeks, it looks like it’s getting bigger, or it appears together with other symptoms, then it’s smart to talk with a licensed healthcare provider, without any delay.
For people who really care about preventive health awareness and prefer more subtle and non-invasive screening choices, ViaScan of Las Colinas provides professional imaging services, like CT scans and whole-body scans, which are reviewed by experienced professionals. These imaging services are meant to encourage health awareness, not replace a clinician’s evaluation or any necessary medical treatment.
Director of Operations at : VIASCAN
John Duncan, Ph.D., has been a leading expert in preventive cardiology for over 20 years. He has dedicated his career to helping thousands of people take control of their health before problems arise.
After working at the Cooper Institute for 15 years, he founded ViaScan, where he has helped tens of thousands of patients gain insight into their health through early detection of cardiovascular diseases and cancer.
