What is breast cancer?

Breast cancer is a type of cancer that begins to start in the breast. Cancer begins when cells get out of hand. It is important to understand that most breast lumps are benign and not cancerous (malignant). Non-cancerous breast tumors are abnormal growths that do not spread outside the breast. They are not life-threatening, but certain types of benign breast lumps can increase the risk of developing breast cancer. Any breast lump or breast change should be examined by a healthcare professional to determine if it is benign or malignant (cancerous) and if it may affect future cancer risk. For more information, see Non-cancerous breast disease.

Where does breast cancer start?

Breast cancer can occur in different parts of the breast.

• Most breast cancers start in the ducts that carry milk to the nipple (duct cancer).

• Some start in the glands that produce breast milk (lobular tumors).

• There are other less common types of breast cancer, such as phyllodes cancer and angiosarcoma.

• A small number of tumors start in other breast tissue. These tumors are called sarcomas and lymphomas and are not actually considered breast cancer.

Many types of breast cancer can cause breast lumps, but not all. For more information on what to look for and report to a healthcare professional, see Signs and symptoms of breast cancer. Many breast cancers are also found during mammography screening, which can detect cancer at an early stage, often before it starts and before symptoms develop.

How is breast cancer spread?

Breast cancer can spread when cancer cells enter the blood or lymphatic system and travel to other parts of the body. The lymphatic system is a network of lymphatic vessels throughout the body that connects the lymph nodes. Clear fluid in lymphatic vessels called lymph, along with cells of the immune system, contains tissue byproducts and wastes. Lymph vessels carry lymph fluid from the breast. In breast cancer, cancer cells can invade these lymph vessels and start growing in the lymph nodes. Most lymphatic vessels drain into:

● Lymph nodes under the arm Lymph nodes around the cervix.

● Lymph nodes in the chest near the breastbone.

How common is breast cancer?

Currently, the average risk for a woman developing breast cancer at some point in her life in the United States is approximately 13%. This means that you have a 1 in 8 chance of developing breast cancer. It also means that there is a 7 in 8 chance that you will never catch the disease.

Signs and Symptoms of Breast Cancer?

Understanding how your breasts look and feel normal is an important part of breast health. Although regular breast cancer exams are important, mammograms do not detect all types of breast cancer. Important it is important to know about breast changes and to know the signs and symptoms of breast cancer. New breast cancer is the most common sign of breast cancer. A hard, painless lump with jagged edges is more likely to cause cancer, but breast cancer can be tender, soft, or round. They can also be painful. For this reason, it is important for a doctor to check for a new breast lump, lump, or breast replacement.


Breast cancer is the most common type of cancer in women, the risk of breast cancer increases with age and occurs more frequently after the age of 50. Each breast has 15 to 20 sections (lobes), each with many smaller sections (lobes). The lobes and lobes are connected by thin tubes (channels). The most common types of breast cancer are those that begin in the ducts (ductal carcinoma). Other types include lobule or lobe cancer (lobular carcinoma), less common is inflammatory breast cancer, which causes redness and swelling of the breasts. The incidence of breast cancer has increased in Western countries, its growth rate has been faster in younger women, but the cause of most cases of breast cancer is unknown. Around 794,000 women are diagnosed with breast cancer each year around the world.