Regarding the symptoms of thyroid cysts, typically, patients with thyroid cysts do not experience any discomfort in the early stages. Often, a neck mass is incidentally discovered during a physical examination, and usually, there are no systemic clinical symptoms. Some patients may experience slight pain. Of course, if the cyst is large or there is bleeding within the cyst, it may lead to symptoms of compression, such as pain, difficulty swallowing, difficulty breathing, or hoarseness. Additionally, some thyroid cysts can affect thyroid function. For instance, if there is hyperthyroidism, symptoms may include heat intolerance, excessive sweating, and weight loss. Conversely, in long-term cases, patients may experience symptoms of hypothyroidism, such as cold intolerance, fatigue, constipation, and poor appetite.