Thymic hyperplasia without symptoms such as dyspnea, muscle weakness, etc., regular review is sufficient. If it is combined with thymoma, thymectomy, radiotherapy and chemotherapy need to be considered. Common causes of thymic hyperplasia include post-chemotherapy, recurrent infections, and thymoma. Thymic hyperplasia refers to an increase in the number of thymus glands and a larger thymus size. 1. After chemotherapy: thymic hyperplasia after chemotherapy is most common in hyperthyroidism, if the thymus is large in size and there are compression symptoms or myasthenia gravis, most or all of the hyperplasia should be surgically removed. 2. Repeated infections: Repeated infections can cause thymus hyperplasia, and thymus belongs to lymphatic tissues, at this time, the infection should be controlled in time, and regular review. 3. Thymoma: when thymoma is combined with thymic hyperplasia, surgical resection will be carried out if conditions permit; if the body can not tolerate the surgery, adjuvant radiotherapy and chemotherapy can be carried out. There are many diseases that cause thymic hyperplasia, so you should go to the hospital in time, be diagnosed and treated by professional doctors, and follow the doctor’s prescription for medication.