Thyroid Disease: Symptoms, Causes, and Testing in Norwalk The thyroid gland may be small, but its role in regulating metabolism, energy levels, and temperature is vital. Thyroid disease affects millions of Americans each year and can lead to a range of symptoms that greatly impact daily life. Understanding the causes, symptoms, and treatments for thyroid disease is key to maintaining your health. AFC Urgent Care Norwalk is here to provide expert testing, personalized care, and ...