<s>[INST] Is pneumonia serious? [/INST] Pneumonia can be very serious, especially in at-risk populations such as children under the age of 5 and adults aged over 65 years. Other risk factors are the presence of comorbidities, e.g., chronic respiratory diseases, diabetes or neurological diseases. Tobacco and excessive alcohol use are other factors that increase the likelihood of suffering a more severe case of pneumonia. Source: Clinic Barcelona. Link: https://www.clinicbarcelona.org/en/assistance/diseases/pneumonia. Field: Lung Disease. Disease: Pneumonia </s>