Bjelland et al. (2010) conducted a study in Norway regarding the number of times of pregnancy and birth in the occurrence of lower back pain during pregnancy. In pregnant women, gestational age 17-30 weeks, while 75,939 people found that pregnant women who suffer from lower back pain during pregnancy, 7.7 percent had symptoms of pain, difficulty walking and had to use crutches to help. It also found that pregnant women who suffer from lower back pain, 15.4 percent have frequent waking at night from the pain occurs.
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