A 40-year-old woman presents with constipation, depression, and dry, thinning hair. She also reports feeling tired all the time, even after sleeping for 10 hours. What could be the potential causes, and what are the next steps?
The symptoms of constipation, depression, dry thinning hair, and excessive fatigue could suggest hypothyroidism. Other potential causes could include iron deficiency anemia, depression, or chronic fatigue syndrome. The next step would be to check thyroid function tests, including serum TSH and free T4 levels.