Most pregnant women experience back pain, usually starting in the second half of pregnancy.

 

The common causes are

 

• Weight Gain: 25-30 pounds weight gain in pregnancy usually strains the spine and the growing baby and uterus put pressure on blood vessels and nerves in the pelvis and back, causing backache. 

• Posture changes: With increase in weight , the centre of gravity changes and strains back.

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• Hormone changes: progesterone increases in pregnancy and relaxes the bones, ligaments and joints, causing strain and backache.

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• Muscle separation: Due to increase in abdominal girth, the muscles of the front abdomen can separate  (the rectal abdominis muscles) .This separation may worsen back pain.  

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• Stress :  Emotional stress can cause muscle tension in the back, which may be felt as back pain or back spasms.