As you age, the tissue and structure of your breasts begin to change. A premenopausal adult woman's breasts are made up of fat, tissue, and mammary glands. As menopause approaches, levels of the hormone estrogen drop, and the mammary glands estrogen stimulates are reduced. Shrinking mammary glands are often replaced by fat, which ends up in softer, less full breasts.
In addition, the connective tissue within the breast breaks down and this loss of internal scaffolding can cause breast sag. Other factors just like the number of pregnancies, smoking, weight gain, and genetics can all play a task in how saggy your breasts become. Breastfeeding has largely been discounted as a cause of breast droop.
Breasts are very aware of hormones within the cycle or in HRT. Oestrogens Hormones increase before a period, causing milk ducts and glands to swell. This can trap fluid within the breasts and cause swelling and lumpiness. Young women usually have dense breasts because their milk systems could be needed for feeding babies. Sometimes this thickness is felt as a lump or a mass of tissue. As women age, their milk systems shrink & are replaced by fat. By menopause, most women’s breasts are completely soft. This can make normal lumps more noticeable. Sometimes women find their breasts feel different once they lose or gain weight and sometimes breasts change for no obvious reason. Your doctor won't be ready to explain why the change in your breast went on. If you feel frustrated by this, it is important to talk openly about your feelings with your doctor and other supportive people.