The life expectancy for Pneumocystis carinii pneumonia varies greatly among individuals and needs to be evaluated in relation to the specific condition. If the underlying disease can be corrected, it may not even affect the life expectancy, but the life expectancy of patients whose underlying disease cannot be corrected, or who have been bedridden for a long period of time, or who have malignant disease, may be affected. 1. Longer life expectancy: In clinical practice, Pneumocystis carinii pneumonia is usually seen in bed-ridden patients, sometimes the patient may only be temporarily bed-ridden after surgery, and after effective treatment, with the control of the infection and the correction of the underlying disease, the life expectancy will not even be affected. 2. Conditions that may affect life expectancy: Pneumocystis carinii pneumonia can also be seen in many patients with serious underlying diseases, such as cerebrovascular disease sequelae of long-term bed-ridden patients, and even sometimes the patient will have a combination of malnutrition, malignant disease phenomenon, the above conditions usually life expectancy will be significantly affected, and may even cause respiratory failure due to severe pneumonia in the short term life-threatening. It is recommended to treat cases of pneumonia under the guidance of a specialist in order to avoid affecting the prognosis.