While extremely rare, physical trauma to the chest can lead to , which is the production of breast milk unrelated to pregnancy or nursing.

In some medical cases, a severe "accident"—such as a seat-belt injury during a car crash—has caused trauma to the milk ducts in postpartum or pregnant women, leading to a massive collection of milk within the breast.

Intense physical stress or chest wall irritation can sometimes trigger the pituitary gland to release prolactin , the hormone responsible for milk production.

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