perceived in the abdomen, which occur spontaneously in the last trimester of pregnancy. Their purpose is to prepare the uterus for childbirth.
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Also called Braxton-Hicks contractions, preparatory contractions vaguely resemble menstrual cramps: most women experience "similar tension in the uterus. At the same time, other mild symptoms may occur, such as hardening of the belly and pain in the lower back.