Amenorrhea is often a sign of another health problem rather than a disease itself, and it can happen for many reasons. It can occur as a natural part of life, such as during pregnancy or breastfeeding. It can also be a sign of a health problem, such as polycystic ovary syndrome (PCOS). Because amenorrhea is associated with health conditions that are also linked to infertility, understanding amenorrhea is an important part of NICHD's research on infertility and fertility.
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