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Published on: 7/14/2026
Why does my right armpit hurt and should I be worried?
Right armpit pain is often caused by muscle strain, swollen lymph nodes from an infection, skin irritation, or changes in the lymphatic system. While most causes are harmless and resolve on their own, you should see a doctor if the pain persists, worsens, or is accompanied by symptoms like fever, a lump, swelling, or unexplained weight loss.
Because armpit pain can stem from so many different causes—ranging from a minor pulled muscle to an infection or something requiring medical attention—guessing isn't the safest approach. The fastest way to narrow down what's likely going on and decide your next step is to take a free, instant, online symptom check. It only takes a few minutes, is doctor-developed, and gives you personalized insight into possible causes and when to seek care—so you can move forward with clarity instead of worry.
Reviewed for medical accuracy: 07/14/2026
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There are several reasons why your right armpit might hurt. Sometimes, this pain comes from simple things like a pulled muscle or irritation from exercise and daily activities.
Another possibility is that the lymph nodes in your armpit, which help fight infections, have become swollen or inflamed. Infections or even changes in the lymphatic system can make these nodes tender.
In some cases, research shows that in people with obesity, fat-enlarged lymph nodes have been linked with more serious conditions, like breast cancer that can spread to the lymph nodes. Also, although very rarely, thyroid cancer can travel to these nodes, causing pain.
Additionally, conditions like lymphedema (swelling caused by problems with the lymph system) can produce discomfort. If your pain is mild and goes away on its own, it may not be something to worry about. However, if the pain is persistent, gets worse, or if you notice other symptoms like lumps, swelling, or overall feeling unwell, you can use Ubie's free AI symptom checker to better understand what might be causing your discomfort and whether you should talk with your doctor for a closer evaluation and treatment plan.
(References)
diFlorio-Alexander RM, Song Q, Dwan D, Austin-Strohbehn JA, Muller KE, Kinlaw WB, MacKenzie TA, Karagas MR, Hassanpour S. Fat-enlarged axillary lymph nodes are associated with node-positive breast cancer in obese patients. Breast Cancer Res Treat. 2021 Aug;189(1):257-267. doi: 10.1007/s10549-021-06262-z. Epub 2021 Jun 3. PMID: 34081259; PMCID: PMC8302552.
Hafez MT, Refky B, Elwahab KA, Arafa M, Abdou I, Elnahas W. Axillary lymph nodes metastasis in a patient with recurrent papillary thyroid cancer: a case report. J Med Case Rep. 2015 Aug 26;9:181. doi: 10.1186/s13256-015-0668-7. PMID: 26307101; PMCID: PMC4549854.
Updated 2023 Apr 19]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK537239/
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