Causes of heart discomfort and hand tremors include hyperthyroidism and arrhythmia. 1. Hyperthyroidism: There are many causes and mechanisms of hyperthyroidism, including Graves’ disease, thyroid nodules, thyroid tumors, and other disease factors, as well as the intake of foods or medications that contain large amounts of iodine, which may lead to hyperthyroidism. Symptoms include irritability, tachycardia, fatigue, sweating, weight loss, loss of appetite, etc. Symptoms of heart discomfort hand tremors may occur. 2. Arrhythmia: the main causes can be categorized as hereditary and acquired; acquired factors include physiological and pathological factors, and arrhythmia can also be induced when there are changes in the structure or function of organs other than the heart; typical symptoms include palpitations and fatigue, and symptoms of cardiac discomfort and hand tremor may occur. The current symptoms are not specific enough to make a definite diagnosis, so it is recommended to go to the hospital to do the appropriate tests for further clarification, such as dynamic electrocardiogram and cardiac ultrasound.