Links to the headlines. Baby brain doesn't exist and the condition is all in mum's mind, say scientists. Daily Mirror, April 7 2015. 'Baby brain' DOESN'T exist: Tests reveal pregnant women and new mothers suffer no decline - leading scientists to declare the condition is 'all in the mind'.
Low Estrogen Premenstrual Symptoms. Low Estrogen Premenstrual Symptoms. While low progesterone is the most common hormone imbalance responsible for PMS and PMDD, and testosterone excess or deficiency may be involved in many cases, low estrogen function may also be contributory to premenstrual symptoms.
1 Prolactin, a hormone that stimulates breast development and milk production during pregnancy, may cause the breast tenderness associated with PMS.  Cortisol is a hormone involved in the body's stress response. An excess of cortisol can cause anxiety and insomnia, whereas a deficiency can lead to depression and lethargy. One study found that women with PMS-related depression had an imbalance of cortisol levels compared to women who had few or no PMS symptoms.