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What is The characteristic symptom of asthma – and explain in detail?
Clinical manifestations of asthma

Wheezing Mast characteristic of asthma                                      
Flaring of nostrils                                                                          
Fatigue
A cough   
Cyanosis
Dyspnea       
Apprehension, restlessness    
Tachycardia     
Pulsus paradoxus                                                                    
Hyper-resonant chest                
In chronic cases, chest becomes barrel shaped   
Cardiac arrhythmias due to sever hypoxemia                                                
Intercostal and suprasternal retraction → Excessive use of accessory muscles of respiration.