I have observed that in my right breast near yo underarms I feel the nerve has been swollen. Is it a sign of breast cancer?

Get an exam done. All women should have their breast examined once every 2-3 years. This is advised to all women over the age of 21 years. It is called a clinical breast examination (cbe). If you have not had one done during the last one year, now is a good time to go see your doctor and let him/her examine the underarm and your breast for any lumps.

Related Questions

Do long lasting swollen lymph nodes in the armpit most likely mean breast cancer?

No. There are many reasons to have swollen lymph nodes. Some are common problems, like infection other are cancerous. Breast cancer is not the only cancer to cause lymph node enlargement. This can only be answered with an examination by a doctor.
When it comes. To cancer, only looking at cells under the microscope can provide reliable answers. You need a physical exam of your brest and axilla, a mammogram and then a biopsy.

I have 2 peasize swollen lymph nodes been under armpit for 6 months. No pain/itch. I'm 24 and not married, would there be a chance for breast cancer?

Small chance. It would be a good idea to be evaluated by your family doctor or surgeon. Most lymphadenopathy in young people is related to reactive benign cause like infection, tattoos, dermatitis, or medications like dilantin. Breast cancer is rare at your age, but not unheard of especially if there is a family history. Hodgkin lymphoma is also a consideration in young women.
Unlikely at your age. Your entire axillary area you will have 20 times more lymph glands than 2, any inflammation in upper arm chest, breast will result in enlarged lymph nodes besides tumors, pea size is not big, in thin people they can be feel normally, don't worry, go and see your doctor.