COVID-19 will die if he exceeds eight times？ Rumors! The symptoms of repeated infection become lighter instead.

　　Covid-19 came back with a comeback. With the increase of the number of "Eryang", some people began to worry that multiple infections would cause the virus to accumulate in the body, resulting in the superposition of symptoms. There are even rumors that people can be infected up to eight times, and more will die. The latest issue of the scientific gossip list was released, which refuted the above statement. In addition, more health rumors have been "concentrated" this time.

　　The monthly "scientific" gossip list is guided by Beijing Science and Technology Association, Beijing Municipal Committee Network Information Office, Capital Internet Association, and jointly released by Beijing Science and Technology Journalists Editors Association and Beijing regional website joint rumor platform.

　　It is rumored that blood tests will reduce human immunity.

　　The truth network will draw blood away the white blood cells with immune function, and also remove substances, electrolytes, vitamins and so on that are important to the body. Even mistaken for the more serious a person is, the more blood tests will be taken, which makes many people stay in bed and even die prematurely.

　　In fact, drawing blood won’t hurt you. Generally, the amount of blood for blood test will not exceed 20 ml, while the average human body has 4000 ml of blood, and it has the function of automatic regeneration. Pumping a small amount of blood will not affect human health.

　　Although the main cells that constitute human immunity are white blood cells, the proportion of red blood cells in the blood is large, while the number of white blood cells is small. Generally, donating 200 ~ 400 ml of blood will lose 1% ~ 2% of the total number of human white blood cells, and within 1 ~ 2 hours after blood drawing, the lost white blood cells will return to their original number. Therefore, many white blood cells will not be lost after blood drawing, and the immunity will not be reduced.

　　It is rumored that asthma patients will "gasp"

　　The truth is that it must not be asthma without wheezing symptoms? For asthma, many people still stay in the performance of "shortness of breath and difficulty breathing" in movies and TV series. In fact, these are just typical manifestations of acute asthma attacks. When patients encounter cold air and dry air, they are prone to asthma attacks. The typical symptom of asthma is recurrent wheezing, which may be accompanied by shortness of breath, chest tightness or cough.

　　However, there are still many atypical asthma in clinic. Cough variant asthma, cough is its only or main clinical manifestation; Chest tightness variant asthma, with chest tightness as the only or main symptom; Concealed asthma does not have the typical symptoms of recurrent wheezing, shortness of breath, chest tightness or cough, but it has long-term increased airway responsiveness.

　　It is rumored that drinking lemonade will lead to stones.

　　There are many causes of truth stone, among which heredity, metabolism, anatomical structure and diet are the main factors, among which diet is the most concerned. From the composition point of view, calcium oxalate is the main stone in the body, and a large amount of oxalic acid in the diet intensifies the formation of stones to a certain extent. For example, the oxalic acid content in vegetables such as spinach, celery and leek is high, but it does not include lemon.

　　Unlike oxalic acid, which forms insoluble substances when it meets calcium, calcium citrate tetrahydrate formed by combining citric acid rich in lemon with calcium is slightly soluble in water. At the same time, the slight acidity of citric acid in the intestine can also promote the absorption of calcium, iron, zinc and other mineral elements, which is beneficial to health.

　　The myth that "water control by hanging upside down" can save drowning people.

　　There is a "classic" picture of rescuing drowning people circulating on the truth network — — The rescuer mentioned that the drowning man’s feet were shaking upside down, or ran backwards with the drowning man’s back, trying to "control" the water in the drowning man’s body before cardiopulmonary resuscitation.

　　However, this way, which is considered to have a higher success rate, is not desirable.

　　To rescue drowning, we should remember "four things without doing one thing". "Don’t do it" means that the drowning person will not control the water after being rescued ashore. The method of running around with drowning children on their backs on the Internet is absolutely wrong. It is impossible to expel water from the body, and it may also make the food in the drowning person’s stomach flow backwards, which will aggravate the difficulty in breathing. Hanging upside down to control water can not replenish oxygen in the blood of drowning people, and most of the water controlled is water in esophagus and stomach. For the drowning person who has already had cardiac arrest, cardiopulmonary resuscitation should be started as early as possible to save the patient.

　　"Four actions" are the four correct steps to deal with the drowning person: First, immediately rescue the drowning person from the water and quickly judge whether breathing or heartbeat stops. Second, call the emergency number 120 and get the AED nearby. Third, for those whose breathing and heartbeat have stopped, cardiopulmonary resuscitation should be carried out immediately according to ABC (open airway — Blow — Press) of the recovery operation sequence. If there is no breathing and heartbeat, just blow (12 ~ 16 times per minute) without chest compressions. Fourth, if there is trauma, deal with it in time, especially head and neck injuries.

　　Rumor has infected COVID-19 eight times at most.

　　Truth With the recurrence of the COVID-19 epidemic, a saying appeared on the Internet that "no matter how healthy and strong a person is, he can only be infected with COVID-19 for 8 times at most, and the person will be gone after the 9th time". The truth is, it is possible for a person to repeatedly infect COVID-19. However, for people who have no basic diseases, the statement that "they can only be infected for 8 times at most" is unscientific, and the symptoms are generally mild after reinfection.

　　At present, the observation and research all show that the symptoms of COVID-19 will become lighter and lighter after reinfection. After the first infection, the body produces immunity to pathogens. Even with the passage of time, the specific immunity level against this pathogen gradually declines. After the second infection, the body can quickly enhance the immunity level again through the recall reaction, killing the pathogens in the body. Therefore, the symptoms will not get worse after repeated infection.

　　In addition, in the process of spreading and spreading, pathogens usually mutate in the direction of gradually weakening pathogenicity and gradually enhancing infection ability.

　　If you are really worried about the problem of repeated infection, people over 60 years old and people with basic diseases can be vaccinated with vaccines and booster shots. Go to crowded places, especially hospitals, try to wear masks all the time, and wash your hands and disinfect them when you get home.

　　Rumor may require hysterectomy to solve dysmenorrhea.

　　Truth Recently, patients with network-transmitted adenomyosis can solve the problems of dysmenorrhea and anemia by hysterectomy. However, the treatment of adenomyosis depends on the severity of symptoms, age and fertility requirements.

　　Generally speaking, doctors will use drugs to relieve the disease first, and if the drugs can’t relieve it and there are fertility requirements, doctors will remove the lesions. Total hysterectomy will only be considered if the symptoms are particularly serious, there is no fertility requirement and medical treatment is ineffective.

　　The data show that 35% of patients with adenomyosis are asymptomatic, but 40%-50% are characterized by excessive bleeding during menstrual cycle, and 15%-30% will be characterized by dysmenorrhea. The treatment of adenomyosis depends on the severity of symptoms, age, and fertility requirements.

　　There are four basic requirements of medical ethics: first, the interests of patients are paramount; Second, respect the patient’s right to choose independently; Third, do not hurt; Fourth, the fairness and justice of medical resources. The third point "no harm" means that if the patient’s uterus has no indication of resection, the doctor will never remove it. If the doctor is removed without indication, then the doctor violates the principle of medical ethics and the provisions of the Physician Law, and will be severely punished.

　　Whether the myth is obese depends on the weight

　　The truth is that as long as you are not overweight, you are not obese? No, obesity needs to consider multiple "technical parameters"!

　　To measure whether a person is obese, the commonly used standard is "Body Mass Index" (BMI). It is obtained by dividing a person’s weight (kg) by the square of his height (m). If this value is between 18.5 and 23.9, it is normal weight, and if it exceeds it, it is obese.

　　In addition, whether obesity depends not only on weight, but also on body fat rate. The ratio between total body fat and body weight is called "body fat rate". Generally, the body fat rate of healthy young men does not exceed 20%, and that of women does not exceed 30%. If it exceeds this value, even if the weight is standard, it is the body fat exceeding the standard.

　　On the basis of weight and body fat percentage, there is also a very important value "waist-hip ratio", which is the ratio between waist circumference and hip circumference. If the waist-hip ratio of men is greater than 0.85 and that of women is greater than 0.8, then even if the weight is normal, it may belong to excess abdominal fat accumulation, or even reach "abdominal obesity", which will bring greater potential harm to the body.

　　Rumor has it that sleeping on a hard bed can cure lumbar spondylosis.

　　Truth Jianghu legend says that "people suffering from lumbar pain had better choose a hard bed to sleep, which can cure diseases". However, this is a misunderstanding. Many people think that "hard bed" refers to hard bed and smooth bed. In fact, the hard bed is relative to the soft mattress that Europeans and Americans are used to. The hard bed does not mean a hard bed, let alone a smooth bed, and there are several mattresses on it.

　　Expert introduction: There are four physiological curvatures in the normal spinal structure of human body, namely, cervical curvature, thoracic curvature, lumbar curvature and sacral curvature. If the mattress is too soft, it cannot provide proper spinal support; If the mattress is too hard, it will rely too much on shoulder and hip support, which will also cause spinal distortion; The middle soft bed (hard bed) can better adapt to the curve of human body, and the spine is the least twisted.

　　So, how to grasp the hardness of the mattress on the bed board? Remember the "3: 1 principle", that is, the mattress should not be so hard as not to deform, nor should it deform too much. A 3 cm thick mattress sinks 1 cm when pressed by hand, and a 10 cm thick mattress sinks 3 cm, so the ratio is moderate.

　　Then, lie flat on the mattress, reach out and touch the neck, waist and buttocks to thighs to see if there are any gaps. Then turn the body to one side and try to see if there is a gap between the concave part of the body curve and the mattress in the same way. If the hand can be easily inserted in the gap, it means that the bed is too hard; If the palm of your hand clings to the gap, it proves that the mattress fits the curve of the human body.

　　In addition, when choosing a mattress, we need to refer to three factors besides hardness and fit: gender, weight and age. Women are suitable for elastic mattresses, while men are relatively hard; Slim figure is suitable for a slightly soft mattress, and obese people should sleep on a harder mattress; Infants should choose a moderately soft mattress, while children and teenagers should not sleep on a soft mattress to avoid affecting their growth and development; Elderly people with loose ligaments, especially those with osteoporosis, are advised to choose a slightly hard mattress.

　　Of course, relieving low back pain is not a very simple thing. Don’t imagine that changing a bed or a mattress can completely solve it. Daily maintenance and rehabilitation exercise, avoiding excessive use of lumbar vertebrae and actively coping with problems are all important links to relieve low back pain.

　　Text/reporter Li Jie