Postpartum upper back pain can be caused by several factors related to the physical and emotional demands of motherhood. Here are some common causes: 1. Posture changes 2. Muscle weakness 3. Carrying and lifting your baby 4. Hormonal changes 5. Stress and tension A combination of these factors can contribute to upper back pain postpartum. Addressing them through proper posture, chiropractic care, and exercises can help alleviate discomfort and promote recovery.