[header] How to identify pms [title] Look for signs of mood changes. [step] You may find yourself crying for no reason at all, and experience feelings of anxiety, anger, depression, sadness or irritability. This is because reduced levels of estrogen during the luteal phase (starts from the ovulation day where the egg is released from the ovary) leads to a drop in serotonin.
[substeps] The brain chemical serotonin is responsible for the regulation of mood and sleep patterns and gives a woman the feeling of well-being. A reduction in serotonin will cause mood changes in a woman.