This Is NOT a Complete List, there are so many breast disorders that we are only going to cover major categories.
Infections and Irritation
Breast infections and irritation are normally caused by hormonal changes and or other issues which can result in mastitis. Mastitis will cause pain, fever and abscesses which may require surgical intervention.
Tumors and Cancer
Fibrocystic Disease, are benign tumors or cysts in the breast, can be mistaken for the cancerous variety. Paget's disease of the breast, on the other hand, is a malignant tumor which means it will progressively get worse until it kills your. Paget's disease doesn't present symptoms that are obviously harmful and can go unnoticed until it is too late if you do not know your body and check for changes.
Early Detection
Early detection can be improved with regular self-exams, and if something is unusual don't be alarmed, simply report it to your doctor. You can also prevent issues by maintaining a healthy and physically active lifestyle combined with eating properly. Remember, not all breast disorders are malignant and early detection will greatly increase your treatment options. Practice makes perfect: if you do your own Self Exam once a month on the first Saturday of the month, you will get to know your breasts well and can be more conscious of gradual changes. The day above was just an example, you should try to pick a day when your breasts won't normally be swollen or sore due to your menstrual cycle.