A member asked:

Is it normal to have sharp twinges in lower back on right side when sitting or laying down at 37 weeks?

A doctor has provided 1 answer
Dr. Laurence Badgley answered

Specializes in General Practice

Not unusual: During pregnancy fetus puts mechanical stress on mother's pelvis & three joints of pelvic girdle. An hormone, relaxin, is secreted & loosens ligaments of these joints in preparation for expansion during birthing process; widening birth canal. Lying impresses pelvic ring transferring biomechanical forces to joints of pelvic girdle. Large pelvis sacroiliac joints torque & stretch pained ligaments.

Answered 9/28/2016

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