①Different sources of disease: influenza is caused by the influenza virus, while the common cold is caused by a variety of pathogens (a variety of viruses, bacteria, mycoplasma and chlamydia, etc.) infection; ②Different degrees of harm: influenza is highly contagious and can cause death within a short period of time, while the common cold is generally not fatal; ③Immunization time: influenza has a long immunization time after healing and is not easy to repeat in the short term, while the common cold has a short immunization time and is easy to repeat in the short term.