It is a disease in which the body and mind feel unwell before menstruation, and gradually improve when menstruation begins.
The Japan Society of Obstetrics and Gynecology defines it as symptoms that appear 3 to 10 days before menstruation, and then lighten or disappear as menstruation begins.

In an in-house survey, 60% of respondents answered that they felt some kind of symptoms before menstruation.
So why do physical and mental disorders occur before menstruation?
The exact cause is unknown, but it is believed to be related to changes in female hormones.

It is thought to be caused by a sudden drop in estrogen and progesterone during the period from ovulation to menstruation, causing abnormalities in hormones and neurotransmitters in the brain.

⇒What are female hormones?

However, since hormones and neurotransmitters in the brain are affected by factors such as stress, PMS is said to be caused by many factors, not just a decrease in female hormones.

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