There are many reasons why people catch a cold. Why do you catch a cold when you catch a cold?

Modern medicine believes that viruses and bacteria floating in the air that can cause all kinds of colds are the root cause of colds and have no direct relationship with colds. Temperature will only affect human function and indirectly induce colds. When the body surface temperature drops, the capillaries distributed in the nasal mucosa contract, the blood supply decreases, the number of immune cells decreases relatively, and the probability of virus entering the nasal cavity to infect cells increases. The humidity in winter is lower than that in summer, and many cold viruses can easily survive in low humidity environment. The pathogen defense ability of human body is related to personal hygiene habits, nutritional status, exercise and so on. If the defense ability is strong enough, pathogens will not easily invade when they appear. At the same cold temperature, some people are more likely to catch a cold because of the difference of personal defense ability. The root cause of cold is virus or bacterial infection.

It seems that catching a cold after catching a cold accords with our life experience. Soak in cold water, get caught in the rain, suddenly cool down, wear too little clothes, and catch a cold in a day or two. Not only China people, but also West Renye Fang has this view. After World War II, scientists began to study this problem. Scientists divide healthy people into several groups. Some people are in a frozen environment, while others stay warm. As a result, they found that as long as they don't touch the cold virus, they won't catch a cold even if they catch a cold. People vaccinated with cold virus, whether they catch a cold or not, will not change the probability of catching a cold. Similar research has been carried out by scientists in different places many times. At present, the mainstream opinion in the medical field is that colds are caused by virus infection and have nothing to do with colds. Many scientists' previous research and Professor eccles's experiments are actually flawed. This question will continue to be debated until there is more convincing research.

May I ask what you think? I'd rather believe such a thing, but I don't think so. Wearing warm clothes makes people more comfortable and has no loss. Why not? The cold and flu mentioned here are not diseases. Influenza is an epidemic infectious disease caused by influenza virus. The common cold usually has mild symptoms and strong autonomy, and the flu is usually harmless, but it is more likely to cause complications such as pneumonia. The flu is more serious than the common cold, such as high fever, headache, severe muscle pain, fatigue and weakness. Colds often occur in autumn and winter. August and September to March and April of the following year are the high-incidence seasons for colds, and they are also the frequent seasons for colds. It seems to be a cold caused by a cold.

Many people will catch a cold in hot weather, and the cold at this time is collectively called hot cold. We also become hot and cold. The main causes of colds in summer are as follows. First, because the summer climate is hot, the body sweats a lot, and gland secretion consumes a lot of energy. In summer, the days are long and the nights are short. Hot weather can easily affect people's normal sleep and rest, so if they don't get enough sleep, they will feel weak. In summer, many people have poor appetite, mainly light food, which affects protein's intake. The hot weather makes people reluctant to exercise outdoors, thus reducing the body's resistance. Due to the large temperature difference between day and night in different areas, the elderly and children are prone to catch a cold at night. Due to the abnormal climate, people can't adapt to the temperature change in time, which increases the probability of virus infection and induces colds. Many people like heatstroke, turning on the air conditioner and taking a cold bath. Besides, they are prone to catch cold in summer.