Pregnant women experience many changes in the body that can be uncomfortable. One is left back pain during pregnancy. This condition is most often felt in the last trimester of pregnancy. Generally, back pain is a common condition experienced by pregnant women because the baby's body is increasingly enlarged followed by enlargement of the uterus as a space for the baby in the womb, especially in the third trimester of pregnancy before delivery. Left lumbago during pregnancy may be felt especially if the baby is more often in the left abdomen. Some pregnant women feel it as normal. However, some others may feel their activities become very disturbed. Even some pregnant women feel it as a trigger for sleep disorders to bring additional stress. Detecting the Cause Recognize various possible causes of left back pain during pregnancy or other back pain around the waist: The relaxin hormone which helps increase ligament flexibility in the pelvic area. This flexibility is needed to