There are two types of the breast cancer consisting of milk ducts, which we call ductal, and milk sacs, which we call lobular, under the main heading. In addition, there are ductal and lobular carcinoma in situ, which is formed in the milk ducts and sacculations according to the potential to spread, which we will be able to call the early stage, which has not exceeded the duct and has not invaded (noninvasive), and there are breast cancers with the potential to spread beyond the occupying duct (invasive). 

After the 1980s, with the prominence of screening mammography and the diagnosis of more patients, the incidence of non-invasive (in situ) cancers in all breast biopsies decreased from 1% to 10%, and their rate in all breast cancers increased from 5% to 15%. 

Ductal carcinoma, which develops in the cells lining the breast ducts that carry the milk out of the breast head, is the most common type of the breast cancer. 

Cancer that develops from the milk-producing glands (lobules) is called lobular carcinoma. 

Inflammatory breast cancer is the worst and fastest-growing type of the breast cancer. It can be confused with inflammatory diseases of the breast that completely surrounds the breast. It progresses with widespread redness and hardness without showing any signs of mass. In inflammatory diseases of the breast that do not heal despite antibiotic treatment, the breast cancer should be considered and a biopsy should be taken. 

Paget disease is a rare type of the breast cancer that is characterized by eczema-like formation seen with skin changes on the head of the breast.