Apathetic hyperthyroidism is a special type of hyperthyroidism, mostly seen in the elderly, characterized by the lack of symptoms of hypermetabolic syndrome of hyperthyroidism in young and middle-aged people, no obvious hyperphagia, some people instead are obviously thin and lose weight, their reaction to the outside world is sluggish, manifested as mental depression, even some patients show a state of wooden stiffness, lack of reaction to the outside world, the patient’s skin is also dry, there can be some gastrointestinal nausea, vomiting and other reactions. However, palpitations or atrial fibrillation are the most common in clinical practice. If a patient develops atrial fibrillation for unknown reasons, especially for the elderly, it is important to check the nail function first to exclude whether the atrial fibrillation is caused by indifferent hyperthyroidism, because the treatment principles are different. For patients with indifferent hyperthyroidism with heavy gastrointestinal reactions, the intake of nutrients must be increased in order to prevent protein imbalance and electrolyte disturbance.