Can pregnancy cause muscle/ligament damage to hips/back? Had some aches /pains there since having baby by c section 4 months ago.

Maybe. Sometimes, the pressure of the pregnant uterus lying on various pelvic nerves, blood vessels and muscles can produce temporary impairments that usually resolve spontaneously shortly after the pregnancy is completed. The joints and ligaments are soften by the hormones of pregnancy to allow the pelvic bones to separate in labor without damage. Evaluation is recommended at 4 months post C/section.