Symptoms usually resolve with menopause.
The cause of PMS is not yet known. Several theories involving imbalances in hormones have been suggested. Current research suggests that the interaction of the hormones that regulate the menstrual cycle may be involved in the syndromes. Stress, nutritional imbalance and lack of regular exercise are thought by some researchers to be important contributing factors to PMS symptoms. Other factors which may be involved include postponing pregnancy until later child-bearing years, recent birth of a child and use of, or recent discontinuance of, birth control pills.