You can eat fishy grass when you have pneumonia. Fishy grass mainly has the functions of clearing heat, removing fire, eliminating carbuncles, draining pus, diuretic and laxative. It can treat coughs caused by canker sores, coughing up pus and phlegm, or coughs caused by congestion of lung heat with relatively good therapeutic effects. The fisetin contained in fisetail herb has good antibacterial effect on various bacterial infections, such as Staphylococcus aureus and Streptococcus pneumoniae, and is also effective in treating viruses and other pathogenic microbial infections. When the symptoms are more serious, it is necessary to combine with cough and phlegm relieving drugs, and also need to use sensitive antibacterial and antiviral drugs for comprehensive and active treatment.