What part of the body does breast cancer usually affect?

Breast cancer usually affects the breast. However, according to Mayo Clinic, while breast cancer starts within some breast cells and spreads to the rest of the breast, it may eventually affect other parts of the body.

Women's Health holds that there are two main types of breast cancer: lobular carcinoma, which begins in the milk-producing glands, and ductal carcinoma, which begins in the milk ducts.

Conditions that increase the risk of getting cancer include being female, having a family history of breast cancer, exposure to radiation, obesity, never having been pregnant, being a first-time mother and more than 35 years old, and having received postmenopausal hormone treatment.