There are many causes of arrhythmia and premature beats in patients, such as drinking strong tea, coffee, exertion, staying up late, mental stress, anxiety, etc. In addition, hyperthyroidism, hypothyroidism, ion disorders, anemia, as well as heart failure, respiratory failure, and lung infections can also cause arrhythmias and premature beats. Serum ions, thyroid function, and blood work can be checked to initially screen the patient for the cause of the arrhythmia. For episodic premature beats, it is not necessary to look for the cause, as most of the episodic premature beats are not significant. If the premature beats disappear after improvement with lifestyle interventions, there is even less need for the relevant tests.