Answer by
ToralDwivedi (606)
Cough with expectoration is a sign of infection anywhere in the bronchial tree starting from pharynx and ending in alveoli which the lung may be trying to expel by coughing. Dry cough in children can be due to allergic inhalations, eosinophilia or beginning stage of tuberculosis. If blood comes out with every cough, it can be tuberculosis or malignancy.