The body temperature of healthy people is relatively constant, the oral surface temperature is generally 36, 3 ℃ a 37, 2 ℃; rectal temperature is generally higher than the oral temperature 0, 3 ℃ a 0, 5 ℃; axillary temperature is lower than the oral temperature 0, 2 ℃ a 0, 4 ℃. The temperature varies slightly among individuals. Normal body temperature fluctuates slightly from day to night, slightly lower in the morning and slightly higher in the afternoon, but the fluctuation range does not exceed 1℃. In the physiological state, the body temperature also has slight fluctuations, such as the metabolic rate of children is higher, its body temperature can be slightly higher than that of adults; the metabolic rate of the elderly is lower, its body temperature can be slightly lower than that of young adults. Women’s body temperature can be lower than usual during menstruation and slightly higher during ovulation and pregnancy. Diet, strenuous exercise, sudden entry into a hot environment and emotional excitement can make the body temperature slightly higher. These temporary increases in body temperature are generally physiological phenomena and do not require medical attention. When the human oral temperature gauge is higher than 37,8℃ (100H) or the anal gauge is higher than 38,2℃ (100,8H), it is considered fever. Fever can occur in both infectious and non-infectious diseases. Fever is a common symptom of all systemic diseases and is seen by subspecialty according to the symptoms accompanying the fever. Coughing is a physiologically protective reflex action and an important defense mechanism of the body. It is an effective way to keep the respiratory tract open by removing secretions, harmful inhalants and foreign bodies from the pharynx and the entire respiratory tract, as well as to prevent secretions from falling into the bronchi and lungs and causing some serious bronchial and pulmonary diseases. Cough, on the other hand, is pathological and is one of the common symptoms of the respiratory system. When organs such as the ear, nose, throat, bronchi, pleura, and lungs are stimulated by inflammation, bruising, physical, chemical, or allergic factors, the vagus nerve branches distributed in these organs transmit to the medullary cough center, causing a cough reflex. Therefore, long-term or repeated frequent coughing that interferes with work, study and sleep; or coughing up sputum that becomes yellow in color, increases in volume and thick in viscosity, may be combined with respiratory pathology or infection and requires consultation and further examination. In addition, in addition to being reflexive, coughing is also autonomic, meaning that consciousness can control it. Common causes of cough are: 1. Acute cough is commonly associated with pharyngitis, tonsillitis, laryngitis, bronchitis, pneumonia and inhalation of foreign bodies. 2. Chronic cough is caused by many diseases. Chronic pharyngeal diseases: chronic pharyngitis, chronic laryngitis, pharyngeal tuberculosis, laryngeal cancer. Chronic bronchial diseases: chronic bronchitis, chronic wheezing bronchitis, bronchiectasis bronchial cancer, alveolar cancer. Chronic lung diseases: tuberculosis, lung abscess, lung cyst, pulmonary schistosomiasis, pulmonary encapsulation, silicosis, pneumoconiosis, alveolar protein deposition, diffuse interstitial lung fibrosis.