Back Pain During Pregnancy

Prevalence and Impact

Back pain is the most common pain complaint during pregnancy, affecting between 50–80% of pregnant women. According to research in Spine (2019), approximately one-third of pregnant women rate their back pain as severe, and 10% report that it significantly impairs daily function. Despite its prevalence, back pain in pregnancy is often undertreated, with many women told it is simply a normal part of pregnancy.

The pain typically begins between the 5th and 7th months of pregnancy but can start as early as 8–12 weeks. Approximately 25% of women continue to experience back pain postpartum, and some develop chronic pain that persists for years.

Types of Pregnancy Back Pain

Lumbar Pain

Located in the lower back at or above the waist, lumbar pain during pregnancy is similar to non-pregnancy-related low back pain. It increases with prolonged postures, forward flexion, and lifting. This type affects approximately 50% of women with pregnancy-related back pain.

Posterior Pelvic Pain

Felt below the waistline, around the sacroiliac joints, and sometimes radiating into the buttocks and posterior thighs. This is the more common type, affecting approximately 65–70% of women with pregnancy-related back pain. It is worsened by asymmetric loading activities such as stair climbing and single-leg stance.

Thoracic Pain

Upper and mid-back pain, often related to breast enlargement and postural changes. Particularly common in the third trimester and during breastfeeding.

Causes and Contributing Factors

• Weight gain: Average pregnancy weight gain of 11–16 kg increases spinal loading by up to 100% on lumbar discs
• Postural changes: Progressive lumbar lordosis (30–40% increase) to compensate for anterior shift in center of gravity
• Hormonal ligament laxity: Relaxin increases collagen turnover and ligament extensibility, reducing spinal stability by up to 40%
• Abdominal muscle stretching: Rectus abdominis separation (diastasis recti) reduces core stability
• Vascular compression: Uterine pressure on the vena cava when supine, causing venous congestion in the pelvis and spine
• Prior history: Previous back pain is the strongest predictor, increasing risk 3–5 fold

Evidence-Based Treatment Options

Exercise and Physical Therapy

A 2015 Cochrane review of 34 studies found that exercise significantly reduces pregnancy-related low back pain. Recommended exercises include:

• Pelvic tilts: Reduce lumbar lordosis and activate deep stabilizers. Perform 10–15 repetitions, 3 times daily
• Cat-cow stretches: Gentle spinal mobilization that relieves pressure on facet joints
• Bridging exercises: Strengthen gluteals and posterior chain. Progress from bilateral to single-leg as strength improves
• Side-lying clamshells: Target gluteus medius for pelvic stability
• Swimming/aquatic exercise: Buoyancy reduces spinal loading by 50–90% while providing resistance for strengthening
• Walking programs: 20–30 minutes daily at moderate intensity improves aerobic fitness and reduces pain scores

Manual Therapy

Osteopathic manipulative treatment (OMT) has Level 1 evidence supporting its use in pregnancy back pain. A randomized trial in the American Journal of Obstetrics and Gynecology (2013) showed OMT reduced pain severity by 50% compared to standard care alone.

Support Devices

Maternity support belts provide external compression and proprioceptive feedback. A systematic review in BMC Pregnancy and Childbirth (2019) found moderate evidence supporting sacroiliac belts for posterior pelvic pain.

Sleep and Ergonomic Strategies

• Side-lying with a pillow between the knees to maintain pelvic alignment
• Full-body pregnancy pillow for comprehensive support
• Avoid prolonged standing; use a small footstool to alternate hip flexion
• When sitting, use lumbar support and keep feet flat on the floor
• Log-roll technique for getting out of bed (turn to side, push up with arms)

When to Seek Urgent Care

References

1. Liddle SD, Pennick V. Interventions for preventing and treating low-back and pelvic pain during pregnancy. Cochrane Database Syst Rev. 2015;(9):CD001139.
2. Katonis P, et al. Pregnancy-related low back pain. Hippokratia. 2011;15(3):205–210.
3. Licciardone JC, et al. Osteopathic manipulative treatment of back pain and related symptoms during pregnancy. Am J Obstet Gynecol. 2010;202(1):43.e1–8.
4. Gutke A, et al. Predicting persistent pregnancy-related low back pain. Spine. 2008;33(12):E386–E393.
5. Casagrande D, et al. Pregnancy-related low back and pelvic girdle pain: biomechanics and management. J Spine Surg. 2015;1(1):105–111.