Various Stages of Chronic Obstructive Pulmonary Disease( COPD )    STAGE 1 - Mild COPD  STAGE 2 - Moderate COPD  STAGE 3 - Severe COPD  STAGE 4 - Very Severe COPD    STAGE-1:   Chronic Obstructive Pulmonary Disease ( COPD ) is a scourge in numerous parts of the world. Most patients with COPD  exhibit gentle ailment. Mild COPD  is the starting stage, the foundation of the administration of mellow infection is a smoking  suspension, which is the main demonstrated intercession to assuage indications, change its normal history and decrease mortality.     STAGE-2:   Numerous individuals erroneously trust these times of expanding shortness of breath, hack, or sputum creation are bronchitis , yet in actuality, they are likely cautioning signs that the condition is advancing. Direct or organize II COPD  is the place most findings are made.     STAGE-3:   At this Stage, you will probably encounter noteworthy lung work weakness. Numerous patients will encounter an expansion in COPD  flare-up...