The good news is sciatica is not very common in pregnancy. However, lower back pain and sciatic-like symptoms are fairly common. In fact, over 50 percent of women have back pain during their pregnancies often caused by muscle tension as joints become more flexible in preparation for childbirth. The ailments... The good news is sciatica is not very common in pregnancy. However, lower back pain and sciatic-like symptoms are fairly common. In fact, over 50 percent of women have back pain during their pregnancies often caused by muscle tension as joints become more flexible in preparation for childbirth. The ailments...