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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.
Pregnancy and breastfeeding are a few of the factors that cause elevated levels of prolactin. Some women do not experience symptoms, but sustained and very high levels can affect the menstrual cycle, fertility and the proper functioning of the optic nerves. slide 1 of 7.