Hyperthyroidism and polycystic ovary syndrome (PCOS)
The people suffering from hyperthyroidism have low-level secretion of thyroid hormone. Low secretion affects the part of the brain that controls breathing and nerves that control breathing. Sleep apnea has also been found in females with PCOS. It is a condition that causes large ovaries to develop and also prevents ovulation. PCOS is also a cause of obesity, which again can lead to sleep apnea.