Armpit lumps are usually harmless and caused by a swollen lymph node or gland. However, some armpit lumps can indicate a more severe condition.

Cysts (fluid-filled tissue pockets), infections, and swollen lymph nodes commonly cause armpit lumps. Finding a lump in your armpit can be worrisome, especially if it hurts or appears unexpectedly.

A lump in your armpit is not normal, so it should be checked by a doctor. In some cases, it could be a sign of cancer, such as: Adult soft tissue sarcoma.

Right-side pain under the armpit may be due to muscle strain, infections, or skin conditions. Sometimes, it may indicate a more serious issue. Read more here.

Most breast lumps are not cancer. But if you find a lump in your breast, see a doctor as soon as possible. Learn the causes of breast lumps, the types, and what you should do if you find one.

In February 2014, I felt a pea-sized lump in my breast, close to my armpit area. I found it randomly, and I was shy about it at first. I did not know if I should say anything.