Generally, women who have a first-degree relative (mother, sister or daughter), multiple second or third-degree relatives (grandparent, aunt or cousin), or those who were diagnosed with breast cancer under the age of 50, are considered at increased risk of developing the disease.
In addition, your chance of developing the disease increases if you have one or more of these breast cancer risk factors:
Family history of breast or ovarian cancer
Breast cancer in a male relative
Genetic testing indicating a mutation in certain genes (BRCA1 or BRCA2 genes)
Pre-cancerous breast biopsy
Dense breast tissue
Chest radiation as a treatment for cancer under age 30
Additional risk factors include:
Age of your first period (starting at age 11 or before)
Age of menopause (starting menopause after age 55)
Use of estrogen-containing drugs
Lifestyle behaviors and habits (weight, exercise, alcohol consumption)
The risk of breast cancer is not something that is exclusive to women, men can also suffer with it.