Ironically, as the baby grows, the pain dissipates. Sciatica often is caused by increased fluid retention around the muscles and pelvic pressure on the nerve. In most instances, physicians don't need to order tests to determine the cause of back pain during pregnancy. In rare cases, however, low-back pain may signal more serious problems such as the separation of the placenta or kidney stones or infection. A patient history, examination and sonogram may confirm the diagnosis.
Most obstetricians recommend conservative treatment for gestational back pain.
Women can modify their activities, apply heat or ice or take Tylenol. As in any pregnancy, narcotics, muscle relaxants and aspirin should be avoided. Do not wear high-heeled shoes, which place added pressure on the back. Take frequent breaks from activities that require prolonged sitting or standing. Sleep on a firm mattress.