If you are going to menstruate, blood tests will not show elevated pituitary prolactin, but if you are exercising strenuously, blood tests may show elevated pituitary prolactin. If you take a blood test for prolactin, it is best to rest for about 10 minutes before taking the blood test to avoid abnormal elevation, which will bring troubles to the diagnosis. Elevated pituitary prolactin is most often caused by endocrine disorders or elevated pituitary prolactin due to pituitary tumors. Once abnormal elevation occurs, further examination should be done to exclude the possibility of other diseases, according to the results and then give the appropriate treatment, the emergence of pituitary prolactin elevation will often make the menstrual flow decrease, and even the possibility of amenorrhea.