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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.
Some women have high prolactin levels without any symptoms. In men, high prolactin levels can cause galactorrhea, impotence (inability to have an erection during sex), reduced desire for sex, and infertility. A man with untreated hyperprolactinemia may make less sperm or no sperm at all.ormally, both men and women have small amounts of prolactin in their blood. Prolactin levels are controlled by other hormones called prolactin inhibiting factors (PIFs), such as dopamine. During pregnancy, prolactin levels go up. After the baby is born, there is a sudden drop in estrogen and progesterone.