Upper respiratory tract infection is the most common disease in humans, and susceptibility varies from person to person. Typical symptoms include cough, sore throat, runny nose, nasal congestion, headache, low-grade fever and sneezing. However, these infections can sometimes cause death in the elderly and immunocompromised. There are two directions for the prevention and treatment of this disease: one is to wash hands frequently, exercise regularly, etc.; the other is to use natural medicines for treatment. Echinacea, astragalus, bee propolis and spirulina are all relatively effective natural medicines for curing respiratory infections.