These stages will be different as well for those undergoing gender transition. The size of the breasts will also vary a lot from one person to another. Yes, breasts can hurt when they grow. Breasts grow in response to the hormones estrogen and progesterone. As you enter puberty, levels of these hormones increase. Your breasts begin to grow under the stimulation of these hormones.
Do breasts hurt when they grow?
Hormone Disruption and Breast Development - Breast Cancer Prevention Partners (BCPP)
A newborn baby has nipples, areolas, and the beginnings of breast tissue, but most of breast development occurs in two different periods of time in a woman's life: first in puberty , then during pregnancy. Breast development is a vital part of puberty in the human female. Interestingly, humans are the only mammals whose breasts develop before they are needed to serve their biological purpose—breastfeeding. The first stage of breast development begins at about six weeks of fetal development with a thickening called the mammary ridge or the milk line. By six months of development, this ridge extends all the way down to the groin, but then regresses. Solid columns of cells form from each breast bud, with each column becoming a separate sweat gland. Each of these has its own separate duct leading to the nipple.
Exposure to chemicals early in life may alter how breast tissue develops and raise the risks of breast cancer and lactation problems later in life, scientists concluded in a set of reports published Wednesday. The scientists are urging federal officials to add new tests for industrial chemicals and pesticides to identify ones that might disrupt breast development. In some cases, they said, mammary glands are more sensitive to effects of hormone-disrupting chemicals than any other part of the body, so low levels of exposure may be causing breast changes.
For endocrinology appointment information, please call For diabetes appointment information, please call the Barbara Davis Center at The onset of breast development in girls less than 8 years of age may be the first sign of precocious puberty or more likely a condition referred to as benign premature thelarche.