Do hormonal imbalances always affect fertility?

Note on the name: in May 2026, polycystic ovary syndrome (PCOS) was formally renamed polyendocrine metabolic ovarian syndrome (PMOS), following a global consensus process. The old name was inaccurate — the condition affects multiple hormone and metabolic systems, not just the ovaries, and "polycystic" wrongly implies ovarian cysts. Nothing about the condition, its diagnosis or its treatment has changed. Both names will be used side by side for the next few years, and we use PCOS below since that is the term most people know.

Not always — it depends on which hormone and by how much. Some imbalances directly prevent conception: absent ovulation, substantially raised prolactin, significant untreated thyroid disease. Others reduce the chance without eliminating it, such as mild PCOS with occasional ovulation. And some have little effect on conception at all. A common source of anxiety worth addressing: a low AMH tells you about the number of eggs remaining, not their quality, and it does not predict your chance of conceiving naturally. Women with low AMH and regular cycles conceive naturally all the time. It matters mainly for predicting response to IVF stimulation. Similarly, mildly raised androgens without other features often have no fertility consequence. Some hormonal issues affect maintaining a pregnancy rather than achieving one — thyroid dysfunction is the clearest example, which is why it is checked and corrected before and during pregnancy. The useful approach is to test, identify what is specifically abnormal, and treat that — rather than assuming any abnormal number is the explanation, or that a normal panel means nothing is wrong.