​"1. Hormonal Imbalance: Sometimes, even after weaning, the pituitary gland continues to produce excess Prolactin, leading to persistent milk production. 2. Duct Ectasia: This is a non-cancerous condition where a milk duct widens and its walls thicken, which can cause fluid buildup and pain. 3. Referred Pain: The shoulder pain might be 'referred pain' from the breast tissue inflammation or could be related to muscle strain from carrying a toddler. 4. Residual Milk: In some women, it takes up to 6 months to a year for milk production to completely shut down after the last feed."

​"To identify the exact cause, I recommend the following: ​Specialist Consultation: You must consult a Gynecologist or a Breast Surgeon for a physical breast examination to check for any lumps or specific areas of tenderness. ​Blood Test: A Serum Prolactin test should be done (ideally in the morning, fasting) to check hormone levels. ​Imaging: A Bilateral Breast Ultrasound (USG) is the best first-step imaging to look at the ducts and ensure there is no abscess or cyst. ​Important Caution: Do not squeeze or express the nipple frequently to check for discharge, as this stimulation actually signals the brain to produce more milk and can worsen the pain."