Congenital immunodeficiency, i.e. primary immunodeficiency disease, is an immune deficiency triggered by congenital inheritance. Patients may have symptoms such as slow weight gain and low immunity, and may be treated with medication as prescribed by the doctor to control the progression of the disease. Primary immunodeficiency diseases are caused by congenital inheritance, such as autosomal recessive inheritance. Patients may have symptoms such as average physical development, slow weight gain, and low immunity. Patients can follow the doctor’s instructions to inject immunosuppressive drugs, such as human gammaglobulin and specific immune serum, to improve immunity and reduce the chance of the disease. Primary immunodeficiency diseases cannot be cured. If the patient is given professional treatment as early as possible, he/she can usually survive for a long time; if the treatment is not timely, the patient may be infected again and again when he/she is young, which may even endanger his/her life. Primary immunodeficiency diseases are hereditary diseases, so it is recommended to follow the doctor’s instructions for professional treatment as soon as possible after diagnosis.