Medically reviewed by Doru Paul, MD Key Takeaways An armpit lump, also called axillary lump, can be a symptom of breast cancer.A healthcare provider should check any hard armpit lump that doesn't ...

Breast lumps are very common. Fortunately, they’re not always a cause for concern. Ordinary reasons such as hormonal changes can cause breast lumps that appear and disappear on their own. Over 1 ...