Can a breast cancer lump be in the armpit, or are they always on breasts?

Can be. The tail of the breast extends all the way up to the armpit.
Armpit & breast. Breast cancer lumps can be in the armpit or lymph node. This is the 1st place a cancer will spread before going to other areas of the body. If cancer is detected early, it should only be in the breast. This is why breast self exam and mammograms are so important.
Breast or armpit. Breast cancer can occur in the armpit for two reasons. One - the breast tissue can extend toward/into the armpit. Two - breast cancer can spread to the lymph nodes of the armpit.
Yes. As breast tissue normally extends up into the armpit, it is possible to develop a breast cancer there. Furthermore, some breast cancers may cause enlargement of the lymph nodes that are normally found in the armpit, which can manifest itself as a palpable lump in the armpit.
Yes. In some women, developmentally, some of the breast tissue is found in the armpit or axilla. This is called polymastia. Changes in the size are typically related to hormonal changes like pregnancy or breast feeding. Although quite rare, breast cancer can even devlop there.

Related Questions

What to do if I have a small lump under my armpit. And it feels as though I have lumps in my breasts, too. Could this be breast cancer?

Always possible. small lumps in armpit are usually of no concern unless they are enlarging and increasing in number. Lumps in the breast are usually normal since by definition breast tissue is lumpy. A solitary firm lump always requires investigation. Either way a mammo and sono should be performed and any further treatment would proceed from there. Read more...

What type of breast cancer that cause the breast to swell and cause under the armpit to have a painful lump? And does that mean the cancer has spread

May not be cancer. Breast cancer usually does not present with pain and swelling in most cases. Pain in armpit may be related to some nearby infection in hair follicle or in breast. See you doctor and get checked asap. Read more...
Possibly IBC. Inflammatory breast cancer occurs suddenly with breast pain, redness, or swelling. It is very fast-growing and spreads quickly. It looks like an infection, so doctors often try antibiotics first, delaying diagnosis. However, infection is also a possibility. See a doctor immediately for these symptoms. If it is cancer, your symptoms don't mean it has spread. But you need a biopsy of any lump! Read more...
Infiltrating duct. All carcinomas of the breast will eventually metastasize or spread to the axilla. Intraductal lesions in the process of converting are within the duct system, non palpable and wont spread until they become invasive. Swelling occurs when the tumor enlarges but not to the extent seen with inflammatory Ca where the swelling is within the subcutaneous lymphatic system only. Read more...

I found a small painless, hard lump in my breast / armpit area. No history of breast cancer in family. I'm not able to manipulat it. Mainly in breast.

Need to examine. If is not feasible to know what you are feeling. You may be feeling a rib rather than a mass in the breast. It would be prudent to see your doctor for an evaluation. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Read more...

Found a lump on my left breast near the armpit. Is this breast cancer?

Possibly. A new breast lump, even in a younger woman, needs to be thoroughly evaluated as it might be cancerous. Please see a doctor. The best place to start would probably be with a primary care physician like an ob/gyn, family practitioner, or internist. If you do not already have a doctor many communities have breast or women's health centers where you could potentially get care. Read more...
Don't neglect. To young, but any lump especially a newly discovered one in the breast around the breast should be checked out. See a physician and have he/she check it out clinically and if needed have a mammography! any family history? If yes, even more urgency! Read more...
Get checked out. You are toung but workup needs to start proper screening with self breast exams looking for new lumps, breast exams by your physician looking for skin or nipple chanes as well as masses or lymph nodes, and mammogram and ultrasound if needed are the best ways to pick up early stage breast cancer before it causes any symptoms. Once advanced it can cause many different symptoms throughout the body. Read more...