The fear of heat after pregnancy is mainly caused by the increase in basal metabolic rate after pregnancy. If, in addition to the fear of heat, the patient also suffers from nausea, vomiting, irritability, sweating, etc., the patient should consider that the pregnancy may be combined with transient hyperthyroidism, and the specific thyroid function should be checked. If the antibodies to thyroid function are normal and the patient’s symptoms are not particularly severe, the patient is mainly considered to have transient hyperthyroidism and can be treated symptomatically without the use of medication for thyroid function. If the patient’s hyperthyroidism is particularly obvious after pregnancy, accompanied by abnormalities such as weight loss and panic attacks, this suggests that the patient’s hyperthyroidism is not transient but pathological, so symptomatic treatment with thyroid medication is needed in this case.