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The laboratory testing done for absence of period (termed as secondary amenorrhea) should include measurements of serum prolactin, thyrotropin, and FSH to test for hyperprolactinemia, thyroid disease, and ovarian failure, which may have been done in your case. The causes of missed or delayed periods are;
1) Ovarian hormone dysfunctions
2) Thyroid hormone abnormalities
3) Stress, anxiety, emotional disorders
4) Sudden weight loss or gain
5) Excessive physical activity
If all the hormonal and above causes are ruled out, one of the most common types of secondary amenorrhea is functional hypothalamic amenorrhea, which by definition rules out pathologic disease. In this there is a decrease in hypothalamic gonadotropin-releasing hormone (GnRH) secretion. Multiple factors may contribute to the pathogenesis of functional hypothalamic amenorrhea, including eating disorders, exercise, and stress. However, in a few women with functional hypothalamic amenorrhea no obvious precipitating factor is evident (this might be true in your case).
Read the resource under the heading secondary amenorrhea;
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