A, cough (cough) is a common respiratory symptoms, due to the trachea, bronchial mucosa or pleura caused by inflammation, foreign bodies, physical or chemical stimuli, the performance is first the vocal folds closed, respiratory muscle contraction, the pressure within the lungs increased, and then the vocal folds open, the lungs air ejected, usually accompanied by sound. Coughing has a protective effect in removing foreign bodies and secretions from the respiratory tract. However, if the cough does not stop and turns from acute to chronic, it often causes great pain to the patient, such as chest tightness, itchy throat and wheezing. The cough may be accompanied by coughing up sputum.
Two, inhalants
Inhalants are divided into specific and non-specific. The former such as dust mites, pollen, fungi, animal dander, etc.; non-specific inhalants such as sulfuric acid, sulfur dioxide, chlorine ammonia. Occupational cough specific inhalants such as toluene diisocyanate, phthalic anhydride, ethylenediamine, penicillin, protease, amylase, silk, animal dander or excreta, etc. In addition, non-specific formaldehyde, formic acid, etc..
Three, food
The phenomenon of cough attacks due to dietary relationships is often seen in cough patients, especially infants and young children are susceptible to food allergies, but gradually decrease with age. The most common foods that cause allergies are fish, shrimp and crab, eggs, and milk.
Four, exercise
Seventy percent to 80 percent of patients with cough induced cough after strenuous exercise, called exercise-induced cough, or sports cough. Clinical manifestations include cough, chest tightness, shortness of breath, wheezing, and rales can be heard on auscultation. Some patients do not have typical asthma manifestations after exercise, but pulmonary function measurements before and after exercise can reveal bronchospasm.
Fifth, because the cough is a non-specific symptom of many diseases, clinical diagnosis must be a detailed history, a comprehensive examination, chest X-ray or CT, airway reactivity measurements, pulmonary function, electrocardiogram, fiberoptic bronchoscopy and some special tests to rule out some of the other diseases that can cause chronic, persistent cough.
Sixth, ordinary X-ray film can detect most of the lung foci, according to the location of the lesion, the scope and morphology of the lesion can sometimes determine the nature of, such as pneumonia, lung abscess, lung cysts, tuberculosis, lung cancer, pneumoconiosis and so on. For deep lesions, X-ray tomography, CT, MRI, CT scanning is superior in that there is no image overlap in the cross-sectional image, and it can detect lesions that cannot be shown on X-ray chest radiographs.