Adult pulmonary Langerhans cell histiocytosis belongs to the category of “lung failure” of lung and kidney deficiency in TCM, which is usually treated by chemotherapy in Western medicine, but in TCM, the treatment is based on the identification of symptoms, including yin deficiency and internal heat, qi and yin deficiency, yang deficiency and water flooding, etc. Further detailed typing is done according to the length of the disease, whether the patient has received chemotherapy and post-treatment complications, and whether there is co-infection, etc. There may be differences between phlegm and heat, and stasis and toxicity. Therefore, despite the presence of deficiency, we should not blindly take tonic to prevent the evil from becoming a problem. Because of the rapid development of the disease after the onset, it is recommended to take medication as soon as possible to avoid missing the time for treatment.