Effects of Progesterone on Breast Growth


Progesterone is a sex hormone that is manufactured when ovulation occurs. Progesterone works in tandem with another hormone, estrogen, to keep a woman healthy and capable of reproduction. Progesterone and estrogen both have an impact on breast tissue and breast size.


  • Progesterone causes fluid retention, which can cause your breasts to swell and become bigger. Progesterone levels are at their peak mid-cycle when you ovulate. Estrogen, the other hormone, makes breast tissue grow.


  • Progesterone prompts the breast tissues to stretch in order to make room for the increase in fluid that happens in your body at certain times during your menstrual cycle.


  • Progesterone also makes the milk-producing cells in your breast grow, which can result in larger breasts, according to Womenandinfants.org.


  • Your breast consists of lobules, as well as alveoli, and these develop due to progesterone. Alveoli are hollow cavities lined with milk-secreting cells. When the alveoli join it forms groups called lobules. Each lobule has a duct that drains into the openings in the nipple.


  • When you retain fluid in your breasts because of progesterone, the retention occurs in the subcutaneous tissues, according to Ameri-breast.com.

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