Insufficient thymus degeneration may lead to myasthenia gravis, or produce localized compression symptoms, and in severe cases, even thymoma and other hazards. Usually, the thymus gland will gradually degenerate or even completely disappear with age when the patient becomes an adult. However, in some patients, the thymus gland does not disappear, or does not undergo obvious atrophy, and may persist for a long time, which is considered as incomplete thymus gland degeneration. If the residual thymus tissue is relatively small, there is usually no serious harm. If the residual tissue is more, it may lead to obvious myasthenia gravis, or produce localized compression symptoms such as panic and shortness of breath, and in severe cases, it may even lead to thymoma and other related diseases. Therefore, patients need to complete chest magnetic resonance, pathologic puncture and other related examinations for a clear diagnosis, and if necessary, surgery can be considered. It is recommended that patients with thymic degenerative insufficiency should consult the doctor in time, complete the relevant examinations, clarify the degree of development of the disease, and then actively treat the disease to avoid adverse consequences.