👉 Perithyroiditis is a type of thyroid disease that affects the function of the thyroid gland. It can be caused by various factors such as stress, infections, and environmental toxins. The symptoms of perithyroiditis include fatigue, weight loss, weakness, cold intolerance, irritability, and difficulty concentrating. These symptoms are often accompanied by an increase in heart rate, sweating, nausea, and vomiting. Treatment for perithyroiditis typically involves medication to reduce the symptoms and improve overall