Most thyroid cysts are benign or noncancerous and require no treatment. However, they should be checked by your doctor on a regular basis, such as every six or twelve months. Your doctor might want to do another biopsy or ultrasound, especially if the cyst increases in size. In some cases, doctors treat benign thyroid nodules with a drug called levothyroxine, which suppresses a hormone that stimulates thyroid tissue growth, but this treatment for benign growths is controversial because its necessity and efficacy are subject to debate. In rare cases, a thyroid cyst might be large enough to cause problems with other structures in the neck, such as difficulty swallowing or breathing. In those cases, surgical removal of the cyst is often an option.