Although colds are caused by viruses, there is no need to take antibiotics and they will gradually reduce until they recover on their own, so there is no need to overstress for most people. However, in some cases, it is important not to underestimate the cold. Viral infections in the early stages of a cold can damage the epithelial cells of the whistle tract and destroy the protective barrier of the human whistle tract, thus making the airway epithelial cells very fragile and susceptible to secondary infection with bacteria and other microorganisms. The resistance of patients in the acute phase of the cold is also impaired, and their ability to fight bacterial infections is lower than usual. Normally, there are parasitic bacteria in our upper whistle tract such as nasal cavity and oropharynx that do not make people sick when immunity is normal, but when our immunity decreases for various reasons, these bacteria become active and turn into pathogenic bacteria that infect the damaged mucosa of the whistle tract and spread to the lower whistle tract, causing bronchitis, bronchitis, pneumonia, and even widespread spread of infection. Therefore, for those whose bodies are inherently weak, a small cold can cause big problems. The elderly, children and infants with weak resistance, people with serious chronic diseases (such as heart and kidney and other vital organ insufficiency), patients with poor immune function such as diabetes and blood diseases, and people with impaired immune function such as those taking anti-rejection drugs after organ transplantation or taking hormones and immunosuppressants for other reasons are not only susceptible to colds, but also prone to These people with impaired immune function are not only susceptible to colds, but also at high risk for secondary bacterial infections. Infections in these people are easily aggravated and poorly treated, affecting the already fragile body, leading to serious infections or aggravated organ failure, or even life-threatening. For patients with chronic diseases of the whistle tract who already suffer from bronchial asthma, chronic bronchitis, chronic obstructive pulmonary disease, emphysema, or pulmonary heart disease, their airway barrier is already damaged by the chronic disease, so in addition to secondary bacterial infections, colds are more likely to aggravate their original whistle tract symptoms, such as increased coughing, large amounts of mucous sputum that cannot be easily coughed out, or increased wheezing or even the need for hospitalization The cough may worsen, a large amount of mucous sputum may not come out easily, or wheezing may worsen and even require hospitalization. Some patients with severe chronic obstructive pulmonary disease may have a small cold that causes acute whistle failure secondary to a serious bacterial infection, requiring resuscitation on a whistle machine in the intensive care unit. So there are often asthma or “slow lung” patients who say “I can not catch a cold, a cold will kill me!” So, what happens when you need to be alert for secondary bacterial infections? Generally speaking, the most severe symptoms of a cold usually last 1-2 days, and then will gradually decrease. If the symptoms do not decrease for more than 3 days or get worse again, or if the body temperature continues to rise, coughing a lot of mucous sputum especially yellow sputum, pus in the tonsils, or elevated blood leukocytes, C-reactive protein, etc., it is a sign of possible secondary bacterial infection. We should pay attention to this, but we should not take antibiotics on our own. We should go to the hospital to get advice from the doctor and receive prescribed medication. In addition to causing whistling symptoms such as sneezing, runny nose, sore throat, cough, etc., certain viruses that cause colds may also invade other organs of the patient and cause viral meningitis, myocarditis, hepatitis, etc. when the body’s immunity is weak. Therefore, if the symptoms of this cold are different from those of the past, or if the symptoms do not decrease within 1 week, or if they increase again after decreasing, you need to go to the hospital for treatment. Many people have the experience that if they do not pay attention to rest or still stay up late or get tired after catching a cold, the cold will not get better easily and even those symptoms of bacterial infection mentioned above will appear. In fact, it is due to the lack of attention to nourish and protect their immunity. The truth is that whether you get a cold and whether a cold can cause other serious conditions boils down to two main causes: infection + weakened immunity. If we protect our immune function, we won’t necessarily get sick if we are exposed to a virus; if we restore our immune system as soon as possible, we will get well faster and be less likely to “get sick”. Therefore, some people have a cold, do not pay attention to rest and a balanced diet, and even some people have to “sweat” against the cold by increasing the amount of activity, which is not beneficial, and sometimes even dangerous, because physical and mental fatigue is the most common and hidden “killer” of resistance. ” So, don’t underestimate the cold. It is important to take rest and reduce stress when you have a cold, as this is an important way to protect our immune system and restore it as soon as possible, in most cases more important than taking medication. If the symptoms of “cold” are not good or new symptoms occur, you should go to the hospital for timely treatment.