Fever is a signal to “overhaul” the body Fever is one of the most common clinical symptoms, all systems of internal medicine have fever as an early symptom or the main symptom of the disease, sometimes it is the only symptom, more often it is an accompanying symptom. Fever belongs to the immune, protective response of the body. Many people treat fever as a disease, but this is actually a misconception. Fever itself is not a disease, but a symptom; it is one of the body’s mechanisms to fight infection. In some ways, fever is even “beneficial” in that it can shorten the duration of illness, enhance the effectiveness of antibiotics, and make the infection less contagious. But a fever is a sign that the body is “malfunctioning” internally, meaning it needs to be “overhauled”. Fever can be caused by a variety of factors. Infectious diseases are almost always febrile, but they also involve multiple specialties, including internal, pediatric, infectious, oncological, neurological, external, gynecological, hematological, and cutaneous. There are approximately 300 clinical causes of fever. It is the physician’s responsibility to explore and master fever patterns and diagnostic methods to minimize misdiagnosis. Among the causes of fever, infection accounts for 50%, mainly including viral and bacterial pathogenesis; the rest are non-infectious factors, such as tumors, metabolic reactions, tissue damage and non-specific inflammation, and production – heat dissipation imbalance (such as heat stroke). 2, how to determine whether you have a fever Everyone’s body temperature varies, but it is roughly around 37 ℃. Humans rely on an advanced thermoregulatory system ‘to stay the same in response to changes’ and survive the selection of nature. Normal body temperature was first derived from 1868, when the average of the axillary body temperatures of 2,500 adults was measured. Any variation in body temperature between individuals within a range of 2.7 degrees is normal. Some people have a higher than standard temperature but do not feel it, while others have a normal temperature but feel feverish on their own. How should this be determined? It is generally believed that the body temperature should be measured (axillary <37℃), and the time to measure the body temperature should be 10 minutes to reach a constant. However, it is important to know that there is also a normal physiological variation in body temperature, which is related to age, gender, morning and evening time, activity level, emotion, menstrual cycle, food or not, seasonal temperature and other factors. This variation is usually within 1 degree of temperature. Normal human body temperature fluctuates slightly during the 24 hours of the day and can vary by 0.6 degrees at different times. The body temperature is lowest at 6:00 a.m. and highest at 4:00 p.m. Women have a slightly higher body temperature before menstruation or during pregnancy, while older people have a lower body temperature. In addition, muscle activity can generate heat, causing the body temperature to rise. Mental stress and emotional excitement can also raise body temperature. When a person is stressed, the body temperature can rise by up to about 2°C. And after surgical anesthesia, the body temperature will drop, so it is important to keep warm. Elderly people have low metabolism and low basal body temperature, and higher than basal body temperature is also considered feverish. 3.How can you make your life more comfortable (1) Optimal room temperature and sleeping temperature - 20℃ When humans first appeared more than 2 million years ago, the average daytime temperature was below 25℃, which is most conducive to the body's distribution of excess heat. In spring and autumn, let the room temperature is kept at about 20 ℃ people are most comfortable. We often say "warm as spring", which means that the average outdoor temperature in the spring in the north is about 20 degrees Celsius. At the same time, 20 ℃ is also the best sleeping temperature. When the room temperature is above 24℃, the sleep will become shallow, and the number of body movements and waking up during sleep will increase. Sleeping temperature below 18℃ is also not conducive to deep sleep. If it is an office, the temperature should preferably be constant at 17℃, which is the most suitable ambient temperature for human thinking, also known as the optimal learning temperature. When the room temperature exceeds 25℃, the human body starts to absorb heat from the outside world and will feel hot. If the room temperature exceeds 35℃, the human body will dissipate body heat through sweating, feel faster heartbeat, accelerated blood circulation, dizziness, general discomfort and fatigue, and have the feeling of drowsiness; on the contrary, when the room temperature is lower than 4℃ it will have the feeling of cold. In general, the indoor temperature in winter should not be lower than 16 ℃, preferably between 18 to 20 ℃; summer indoor temperature should not be lower than 23 ℃, preferably between 25 to 27 ℃. Such a temperature ensures comfort and does not make the difference between indoor and outdoor temperatures too great, leading to illness. In addition to the temperature itself, the hot and cold people feel is also related to the humidity. Meteorologists statistics, when the relative humidity is at 30%, the temperature of heat stroke is 38 ℃; when the relative humidity reaches 80%, the temperature at 31 ℃ will be someone heat stroke. (2) the best drinking water temperature - 35 to 38 ℃ This temperature is closest to the human body temperature. For hot drinks, the best temperature for brewing honey water is 50 ℃; hot milk, hot soup, etc. taste best at 60 ℃. In any case, the temperature of drinking water and eating food, should never exceed 60 ℃. For cold drinks, soda is the most delicious at 5 ℃. (3) the best bathing temperature - 39 ℃ Bathing water temperature should be between 35 and 40 ℃, slightly higher than the body temperature of 39 ℃ is most suitable. Too high water temperature will destroy the protective layer of skin, so that the skin loses resistance to pollution and bacteria. (4) the best foot soak temperature - 38 to 43 ℃ foot temperature is the lowest in the body, so the foot soak water can be a little hot, can promote the expansion of the blood vessels in the feet and lower limbs, so that the brain can rest and help sleep. It is best to use a deep wooden bucket to soak feet, and cover a plastic sheet on the bucket to achieve better insulation effect. Add ginger, cinnamon and other herbs to the foot soak water, more help to promote blood circulation and strengthen the body. (5) the most likely to get sick temperature - cooling ≥ 10 ℃ The most likely to make people sick, not the coldest time of winter, but when the temperature plummets. Generally speaking, the temperature drop (i.e. temperature difference) of more than 10 ℃ within 24 hours can be considered a sudden drop, when people's ability to tolerate the temperature can not catch up with the temperature change, resistance to 'blind spots', the most vulnerable to illness. Therefore, in addition to the absolute temperature, should pay more attention to the impact of temperature changes on health. High winds and low temperatures or low temperatures in the morning in the northern winter are the most frequent periods of illness.