Blood donation is not recommended for hyperthyroidism. Donating blood for hyperthyroidism is very harmful to yourself or the recipient, and can cause aggravation of hyperthyroidism, thyroid crisis and changes in the thyroid function of the recipient. 1. exacerbation of hyperthyroidism: hyperthyroidism may have its own immunity decline, blood donation is relatively insufficient, hyperthyroidism has not been stabilized control, hyperthyroidism may be aggravated. 2. Thyroid crisis: when donating blood, hyperthyroidism may cause thyroid crisis due to the decrease of circulating blood volume in the body, which may result in stress reaction, showing symptoms such as tachycardia, low blood pressure, heart failure and electrolyte disorders. 3. Alteration of thyroid function of the recipient: the thyroid hormone in the blood of patients with hyperthyroidism is usually too high, and the transfusion of this kind of blood into the recipient’s body will affect the abnormal proliferation of the thyroid tissue of the recipient, resulting in the alteration of thyroid function. Patients with hyperthyroidism are advised to visit a hospital in time for diagnosis and treatment under the guidance of a doctor.