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what is the difference between lung cancer, emphysema, and asthma

what is the difference between lung cancer, emphysema, and asthma
Science   Anatomy-And-Physiology   
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Lung cancer: lung cancer is the condition when a cancer begin in lungs. In this condition the lung cells start divide uncontrollably. Symptoms may include cough with blood, chest pain, weight loss and wheezing.

Emphysema: it is the condition in which alveoli (air sacs) are damaged. Inner walls of the air sacs weaken and rupture with time. Most common symptoms include shortness of breath, a lot of mucous and frequent lung infection.

Asthma: it is the condition in which the airway becomes inflamed, narrow and swell and produce extra mucous. The symptoms include difficulty in breathing.

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