Many body changes occur over the gestational period. Here are some reasons:
1. Release of pregnancy related hormones helps relax joints and soften ligaments. This allows the baby to grow in your womb. Joints may move more than usual. This may cause extra strain on your back and pelvic joints. In turn, this may result in muscle spasms.
2. The growing baby may result in increased stress on pelvic ligaments, abdominal and back muscles. This in turn may result in Back pain, at times Sciatic nerve irritation, with ache and or numbness down the legs.
3. Headaches may be caused by increased emotional stress and muscle spasms during pregnancy.
4. Towards the end of pregnancy the positioning of the growing baby may cause further pressure and compression resulting in various musculoskeletal aches and pains.