This is a sudden feeling of breathlessness along with some musical sounds and relived after sometime which could last for few hours, days or months and if severe attack occurs it may endanger patient's life.

As it is a complete reversible disease of airways which react as a abnormal protective mechanism for external environmental factors to protect lungs. But at expense of the patient breathlessness.

So the main features of bronchinal asthma is sudden onset of breathlessness and musical sounds & chest tightness