Dry cough

Introduction Cough without sputum or sputum is very little, called dry cough, referred to as dry cough, common in acute pharyngitis, early stage of acute bronchitis, pleurisy, mild tuberculosis.

Cause

Clinically, most chronic dry coughs are allergic coughs, also known as cough variant asthma or allergic bronchitis.

The causes of allergic cough are complicated, but mainly include two aspects, namely the physical and environmental factors of patients with allergic cough. The patient's constitution includes subjective conditions such as "genetic quality", immune status, mental state, endocrine and health status, and is an important factor for patients with susceptibility to allergic cough. Environmental factors include various allergens, irritating gases, viral infections, areas of residence, living conditions, occupational factors, climate, drugs, exercise (hyperventilation), food and food additives, eating habits, social factors, and even economic conditions. Etc. may be the more important cause of the development of allergic cough. The increasing incidence of allergic cough is also related to the susceptibility and environmental factors caused by the patient's allergic constitution.

an examination

Related inspection

Chest CT examination of respiratory syncytial virus antibody

Laboratory examinations must be summarized and analyzed based on objective data learned from medical history and physical examination, from which several diagnostic possibilities may be proposed, and further consideration should be given to those examinations to confirm the diagnosis. Therefore, in view of the dry cough and its associated symptoms, laboratory tests such as blood routine, lung X-ray, laryngoscope, etc. can be performed.

Differential diagnosis

Identification:

1, pharyngitis

Chronic pharyngitis is a common pharyngeal disease, and its prominent symptom is irritating dry cough. Because of the itching and discomfort in the pharynx, the patient often clears the dry cough of the pharynx, and the symptoms are more obvious when speaking. The symptoms can be alleviated after drinking water or after swallowing. Most of them are secondary to upper respiratory tract infections, or frequent smoking, alcoholics and some people who are exposed to certain harmful dust or gas.

Pharyngeal congestion can be seen in the pharyngeal examination. There are many dilated capillaries and a small amount of lymphoid follicles on the surface of the posterior pharyngeal mucosa. The mucosa of the posterior pharynx and some exposure to harmful dust or gas are more common.

2, laryngitis

The main symptoms are hoarseness, which often occurs intermittently in the early stage, and occurs every time when the pronunciation is high. If the condition is aggravated, the vocalization can be sustained, but none of them are rare. Because the patient has a dry cough to relieve symptoms.

Acoustic laryngeal mucosa examination, patients with chronic simple laryngitis often show larynx mucosal congestion, vocal cord tarnish, there are dilated blood vessels distributed, mucus secretion increased; when the disease progresses to a chronic proliferative laryngitis, The mucosa is obviously thicker and dark red, and its margin is thick and round, and the pronunciation is often closed. The throat chamber is often thickened by compensatory activities. Chronic atrophic laryngitis is rare, and yellow and green often appear after coughing. The suede has a burning or painful sensation in the throat.

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