Why do I have a sharp pain in my armpit and should I see a doctor?

There are a few reasons why you might feel a sharp pain in your armpit. One common cause is swollen lymph nodes, which are small glands that help your body fight infections. When these nodes become active—such as during an infection or inflammation—they might feel tender or give you a sharp pain. In some cases, conditions related to past treatments or surgeries, especially in breast cancer survivors, can lead to lymphatic pain in the armpit. Sometimes, skin issues, irritation, or an imbalance in the natural bacteria around the skin can also cause discomfort. While a one-time sharp pain may just be a small, temporary issue, repeated or worsening pain should be checked by a doctor. If you're experiencing armpit pain and want to better understand what might be causing it, try Ubie's free AI symptom checker to get personalized insights in just a few minutes. Seeking medical advice is important if you notice lasting pain, feel a mass, develop fever, or experience any new symptoms with the pain. A doctor can examine you and run tests to determine if the cause is a minor irritation or something that needs further treatment.