Contraction (childbirth)

In medicine(obstetrics), a contraction is a forceful motion of the uterus, generated by the release of oxytocin("quick labor") by the pituitary gland, culminating in childbirth.

The uterusalso contracts during menstruation.

When the uteruscontracts it often causes pain - ranging from a mild twinge to severe pain.

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It uses material from the Wikipedia article Contraction (childbirth).