Chronic interstitial nephritis is a group of diseases or clinical syndromes caused by a variety of etiologic factors and characterized by renal tubular dysfunction. The control of chronic interstitial nephritis varies from person to person and cannot be generalized. Patients with well-controlled disease have better prognosis and longer survival; patients with poorly controlled disease (rapid progression and poor compliance) have worse prognosis and shorter survival. 1. Good disease control: If the patient’s condition progresses slowly, and is relatively stable after removing the causative factors (e.g., infection, etc.) and active symptomatic treatment (e.g., correcting the water-electrolyte balance, controlling hypertension, etc.), and if the patient’s adherence is very good, with regular checkups and active cooperation with the treatment, the patient’s prognosis is better and his or her survival period will be relatively longer. 2. Poor disease control: If the patient’s condition progresses faster, such as chronic interstitial nephritis caused by immunity and other factors, the condition is still unstable after active treatment, and the patient’s compliance is poor and the treatment is not active, then the patient’s prognosis is poor, and the survival period is relatively short. Therefore, the prognosis of chronic interstitial nephritis is closely related to the disease itself as well as the patients themselves. No matter what the situation is, it is recommended that the patients go to the hospital for active treatment to avoid aggravating the condition.