Differential Diagnosis for Back Pain in Pregnancy

Primary Diagnostic Categories

Back pain in pregnancy should be systematically categorized into three main groups: non-specific musculoskeletal pain, radiculopathy/spinal stenosis, or specific spinal pathology requiring urgent evaluation, according to the American College of Obstetricians and Gynecologists 1

Pregnancy hormones cause ligamentous laxity that reduces ligament rigidity throughout the body, weakening joint stability and increasing demand on stabilizing muscles, as stated by the American College of Sports Medicine 2, 3
The growing uterus shifts the center of gravity forward, creating additional load on the musculoskeletal system and forcing postural compensations that stress the spine, according to the American College of Obstetricians and Gynecologists 2
Non-specific musculoskeletal pain affects up to two-thirds of pregnancies, with peak prevalence at 6-7 months gestation, as reported by the American College of Obstetricians and Gynecologists 2, 1

Clinical signs of radiculopathy or spinal stenosis include sciatica, pseudoclaudication, motor deficits at multiple levels, according to the American Academy of Neurology 1
Neurologic findings include specific dermatomal sensory changes, reflex asymmetry, and focal motor weakness, as stated by the American Academy of Neurology 1

Cauda equina syndrome is a surgical emergency even during pregnancy and requires urgent MRI evaluation without gadolinium, according to the American College of Radiology 2, 1
Sacral fractures are rare but documented in pregnancy, labor, or immediately postpartum, presenting with intractable lower back or pelvic pain and loss of mobility, as reported by the Journal of the American College of Radiology 4
Femoral neck stress fractures can be lateral tension-type or medial compression-type, with different treatment approaches, according to the American College of Radiology 4

Appendicitis is the most common non-obstetric surgical condition in pregnant women, occurring in 1 in 20 women of childbearing age, as stated by the American College of Surgeons 1
Intra-abdominal pathology, such as pancreatitis, nephrolithiasis, ureteral stones, or aortic aneurysm, should be considered in the differential diagnosis, according to the American College of Obstetricians and Gynecologists 1

Heavy lifting, defined as lifting 10-20 kg more than 20 times per week, significantly increases musculoskeletal pain risk, as reported by the American College of Sports Medicine 2, 3
Obesity, prior back pain, and multiparity are also risk factors for back pain in pregnancy, according to the American College of Obstetricians and Gynecologists 2, 3

Severe pain can have a significant impact on sleep, daily activities, and mental health, and psychosocial factors can predict the risk of chronic disabling back pain, as stated by the American College of Obstetricians and Gynecologists 2, 1

Underreporting and inadequate screening for red flags can result in serious long-term morbidity, according to the American College of Obstetricians and Gynecologists 2, 1
Inappropriate imaging and overlooking non-spinal causes can also lead to delayed or incorrect diagnosis, as reported by the American College of Radiology 1

Sciatica is characterized by pain radiating down the leg below the knee in sciatic nerve distribution, according to the American College of Physicians 5
Pseudoclaudication is leg pain on walking/standing, relieved by sitting or spinal flexion, as reported by the American College of Physicians 5
Red flag symptoms for cauda equina syndrome include urinary retention or incontinence, bilateral motor weakness of lower extremities, and saddle anesthesia, as identified by the American College of Physicians 5

Placental abruption is associated with severe back pain and vaginal bleeding, and is a critical condition that requires urgent evaluation, as recommended by the American College of Radiology 6
Labor is characterized by regular, painful uterine contractions with back pain, as described by the American College of Radiology 6
Ectopic pregnancy in the first trimester can cause unilateral pelvic/back pain with positive β-hCG, according to the American College of Radiology 6