Penicillin is effective against pneumonia. In clinical practice, bacterial pneumonia is common, and bacterial pneumonia is dominated by Streptococcus pneumoniae infection, which is a gram-positive coccus, and penicillin is very sensitive to gram-positive coccus and can inactivate it. If you are allergic to penicillin, you can use cephalosporins or respiratory quinolones. Pneumonia is mainly treated with active anti-infection therapy, and symptomatic supportive treatment should also be strengthened during treatment, bed rest is advocated, adequate protein, calories and vitamins are supplemented, and the diet should be light, avoiding spicy and stimulating foods.