A 35-year-old woman presents with irregular periods and infertility. She also reports weight gain, constipation, and feeling cold all the time. What could be the potential causes, and what are the next steps?
The symptoms of irregular periods, infertility, weight gain, constipation, and cold intolerance could suggest hypothyroidism. Other potential causes include polycystic ovary syndrome or other hormonal imbalances. The next step would be to order thyroid function tests, including serum TSH and free T4 levels.