09/08/2026
🦋 CAN THYROID PROBLEMS CAUSE PCOS or MENSTRUAL IRREGULARITIES?
Yes , thyroid disorders can definitely cause menstrual irregularities, but they don’t directly cause PCOS.
This is actually a common source of confusion.
For example, an underactive thyroid (hypothyroidism) can affect the hormones responsible for ovulation. As a result, periods may become irregular, delayed, unusually heavy, or may stop altogether. Some women may also have difficulty conceiving.
The problem is that these symptoms can look very similar to PCOS. Someone with hypothyroidism may have irregular periods, weight gain and fertility problems and may assume, “I probably have PCOS.”
But PCOS and thyroid disorders are two different conditions. Having a thyroid problem doesn’t mean that you have PCOS, and treating the thyroid problem doesn’t mean you are treating PCOS.
That said, both can exist in the same person, so thyroid function is usually considered when a woman presents with unexplained menstrual irregularities.
So if your periods have suddenly become irregular, don’t jump straight to the conclusion that it’s PCOS. Pregnancy, thyroid problems, high prolactin, stress, significant weight changes and several other conditions can affect the menstrual cycle.
The important thing is to find out why the periods are irregular, rather than simply putting a label of “PCOS” on irregular menstruation.