Right-sided pain under the armpit may be due to muscle strain, infections, or skin conditions. Sometimes, armpit pain may indicate a more serious issue, such as cancer or a heart issue. The armpit ...
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 ...