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1 Breast stimulation can modestly increase the amount of prolactin in the blood. 2  Chest wall trauma (for example, an injury from a car steering wheel after an accident) can lead to increased levels of prolactin.  Marijuana use is also a well documented cause of elevated levels of prolactin.
Prolactin is a hormone made by the pituitary gland. Its primary purpose is to promote milk production for a woman who is breastfeeding. In other situations an elevated prolactin level is abnormal and may cause problems. There are several symptoms or problems that can result from high prolactin levels. Breast enlargement or tenderness in men (called gynecomastia), or breast milk production in both men and women can occur.