Behavioral health factor 4), it was found that smoking habits before pregnancy and while pregnant is associated with the occurrence of severe lower back pain while pregnant. Description from the chemicals in cigarettes results in contraction, while pregnant, the uterus is a vascular area to pelvis; Make a pregnant woman with blood vessel contraction and causes ischemia occurs. So, those who smoke with intense pain than non-smoking group. (Kauppila,&Penttila,1994 cited in Biering et al., 2010)
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