Children’s cough is the most common symptom of the disease and is easily recurring. Parents are worried when coughing is always bad; they do not want to see a doctor if they have a cough, so many parents choose to buy medicines in pharmacies. Buying medicines on their own requires parents to initially identify the cause of their child’s cough. The following describes the characteristics of coughs caused by different causes. 1. Cough caused by cold Initially, it is mostly a single irritating dry cough, with phlegm at a later stage. In severe cases, the cough is frequent, with nasal congestion, sneezing, runny nose and sore throat, sometimes accompanied by a low fever, with a body temperature not exceeding 38°C, poor spirit and loss of appetite. It is usually not accompanied by shortness of breath or shortness of breath. Upper respiratory tract infection is a viral infection of the nose, pharynx, tonsils and larynx. If the inflammation is confined to a particular site, it is named according to the inflammation of that site: acute rhinitis, acute pharyngitis, acute tonsillitis, acute laryngitis. They can also be collectively called upper respiratory tract infections, commonly known as “colds”. It is prevalent in all seasons, and is more common in spring and autumn when there is a big change in temperature. Generally, they have experienced cold, such as sleeping with stirrups at night, wearing too little clothing, bathing in the cold, and blowing air conditioners. 2, pharyngitis caused by cough Mostly irritating cough, a single throat-clearing dry cough, not violent, more frequent when resting, but less when playing. With pharyngeal discomfort, pain, itching or dryness, sometimes burning, smoky, foreign body sensation, etc., always feel that there is something on the throat, cough a few times to relieve this discomfort. In addition to some redness and swelling in the throat, there are no other abnormal findings. 3.Acute laryngitis causes coughing. The cough is dry and hoarse, and when coughing, there is the sound of “clunking” and a “barking” cough. The baby’s symptoms are usually better during the day and worse at night. It can occur in any season and is most common in babies aged 6 months to 3 years. 4. Tracheitis cough The main symptom is coughing, initially dry, later with phlegm, often severe in babies under 3 years old, often with fever, vomiting and diarrhea. Older children have milder systemic symptoms, often with headache, chest pain, and coughing up mucus or pus sputum. 5, capillary bronchitis cough cough is a persistent dry cough, episodic wheezing is its characteristic, wheezing attack breathing significantly faster, up to 60 ~ 80 times per minute or more, and accompanied by prolonged expiration and expiratory wheezing; heavy baby can appear nasal stirring and “three concave sign” (that is, inspiration appears supraclavicular fossa, suprasternal fossa and upper The baby is often irritable and moaning; in more severe cases, the baby can be combined with heart failure or respiratory failure. Capillary bronchitis is a common acute lower respiratory tract infection in children, mostly caused by viruses, especially respiratory syncytial virus. It differs from general bronchitis or bronchiectasis in that the clinical symptoms are like pneumonia, but wheezing is predominant. This disease occurs mostly in children under 2 years of age, and is most common in children under 6 months of age. 6. Allergic cough Also known as cough variant asthma, the cough is mostly irritating dry cough with little sputum. The cough mostly attacks only at night or early in the morning, or intensifies after exercise and when crying. It is accompanied by a tickling in the throat. It is often triggered and aggravated by colds, exercise, cold air inhalation, and can also be triggered by exposure to pollen, dust, or certain foods. The cough is recurrent or persistent for more than a month; there are no clinical signs of infection or antibiotic treatment has been ineffective for a longer period of time; the cough can be significantly relieved with calming medications; there are often personal or family allergies. It is one of the common causes of chronic cough (meaning that the cough lasts longer than 4 weeks) in babies over 3 years of age. 7. Bronchial asthma Typically presents with recurrent episodes of cough, shortness of breath, dyspnea and chest tightness. The cough is frequent, mostly dry and irritating, and can discharge white foamy sputum. Before the attack, there are often aura symptoms such as nasal congestion, sneezing and itchy eyes, and in severe attacks, severe dyspnea and hypoxemia appear within a short time. Attacks and exacerbations at night or in the early morning are one of the characteristics of asthma. Asthma symptoms can come on within minutes. Some symptoms are mild and may resolve on their own, but most require aggressive management. Asthma can be without any signs and symptoms when it is not attacked. 8, foreign body aspiration cough is the most common symptom of foreign body aspiration in the airway, coughing is usually manifested as a sudden paroxysmal violent choking cough. When the foreign body blocks the airway, there may be breath-holding, hoarseness, pallor or bruising, difficulty in breathing, and even asphyxia. Chest X-ray, chest CT or fiberoptic bronchoscopy may clarify. Relief, but most of them need active management. 9. Upper airway cough C combined Originally called postnasal drip syndrome, it refers to chronic cough caused by various rhinitis, sinusitis, chronic pharyngitis, chronic tonsillitis, adenoid hypertrophy and other upper airway diseases. Cough with or without sputum, cough is worse in the early morning or when the position is changed, often accompanied by nasal congestion, runny nose, dry throat with foreign body sensation, repeated clearing of the throat, a sense of mucus attachment to the posterior pharyngeal wall, a few babies complained of headache, dizziness, low fever, etc.; examination of the sinus area may have pressure pain, the sinus opening can be yellowish-white discharge, the posterior pharyngeal wall follicles are obviously hyperplastic, cobblestone-like, sometimes visible mucus-like attachment to the posterior pharyngeal wall; accompanied by A large amount of sputum is mostly caused by chronic sinusitis; caused by adenoid hypertrophy, there is excessive snoring and breath-holding during sleep, open-mouth breathing during sleep, sweating, morning headache, daytime drowsiness, learning difficulties, etc. Adenoid hypertrophy causing upper airway cough syndrome is unique to children.