If you have a cold, you can prevent it by keeping warm, drinking plenty of water, and exercising properly, but if there are viruses and other disease-causing factors in your body, you may still develop a cold. Generally speaking, the human body may have a cold after getting wet, cold and close contact with respiratory patients. At this time, the susceptibility can be reduced by paying attention to warmth to avoid catching a cold again, drinking more water, strengthening physical exercise, eating and drinking regularly, and paying attention to resting to avoid excessive exertion, etc. When the human body already has viruses and other pathogens in the body, it may be due to the lack of immunity and the onset of the disease. It is recommended that those who meet the indications for vaccination actively receive influenza vaccination, which can effectively prevent influenza. When you feel like catching a cold, you can regulate the situation through the above, but it does not necessarily prevent the occurrence of the flu, the specific needs to be combined with the individual’s physical condition and whether or not inflammatory infections occur. If you feel unwell, you should seek medical attention.