In medicine (obstetrics), a contraction is a forceful and painful motion of the uterus as part of the process of childbirth. Contractions, and labour in general, is one condition that releases the hormone oxytocin into the body. Prior to actual labour, women may experience Braxton Hicks contractions, sometimes known as "false labour." The uterus also contracts during menstruation. These contractions may be uncomfortable or even painful, but they are generally significantly less painful than contractions during labour. The harder and longer the contractions, the more the woman has the urge to push. The woman pushes on a contraction, which, as the labour intensifies, become longer.
