Back Pain

What It Is & Why It Happens

Lower back pain is a very common pregnancy symptom, experienced by up to 70% of pregnant individuals. It is primarily driven by three factors:

1. Hormonal Joint Laxity: During pregnancy, your body releases the hormone relaxin. Relaxin relaxes the ligaments and joints in your pelvis to allow them to stretch during childbirth. However, this relaxation also affects the ligaments supporting your spine and lower back, reducing stability and causing strain.
2. Shifting Center of Gravity: As your uterus grows larger and heavier, your center of gravity shifts forward. To compensate and maintain balance, you naturally lean backward, straining the lower back muscles and spine.
3. Muscle Strain & Separation: As the uterus expands, your abdominal muscles stretch and may separate (diastasis recti). These muscles normally support your spine; when they weaken, your back muscles must work harder to carry your weight.

Typical Timeline

Back pain can start at any point, but it typically begins in the second trimester around Week 12 to 16 as the uterus grows out of the pelvis. It increases steadily in frequency and intensity during the third trimester (weeks 28–40) as the baby’s weight increases. It is often most intense at the end of the day or after prolonged standing.

Safe Comfort Measures

You can minimize and manage pregnancy back pain using several evidence-based comfort measures:

• Practice Good Posture: Sit up straight and stand with a wide, stable stance. Avoid locking your knees. Use chairs with good lumbar support.
• Side Sleeping: Sleep on your side with a thick body pillow or a pillow between your knees and another supporting your belly to keep your spine and pelvis aligned.
• Wear Supportive Footwear: Avoid high heels or completely flat shoes with no arch support. Choose low-heeled, supportive walking shoes.
• Maternity Support Belt: Wearing an elastic maternity support band under your belly can lift the weight of the uterus and reduce strain on your pelvic joints and lower back.
• Gentle Exercises: Gentle stretching, prenatal yoga, and core-strengthening exercises (like pelvic tilts) can strengthen the muscles supporting your back.
• Apply Warmth or Cold: Apply a cold pack or a warm compress (or a low-setting heating pad) to your lower back for 15 minutes. Ensure you do not apply heat to your abdomen.

When to Call the Doctor (Red Flags)

While back pain is common, certain symptoms can indicate a more serious issue. Contact your healthcare provider immediately if you experience:

• Back pain that is severe, constant, or worsening, especially if it starts suddenly.
• Regular, rhythmic back pain that comes and goes (like menstrual cramps), which can be a sign of preterm labor or active labor.
• Back pain accompanied by vaginal bleeding, fluid leakage, or pelvic pressure.
• Painful or burning urination, cloudy or foul-smelling urine, or fever (which can indicate a urinary tract or kidney infection).
• Numbness, tingling, or weakness in your legs, feet, or groin.