Asthma


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What is asthma?
A long term (chronic) lung disease. uIt is an irritation and swelling in the airway that carry air in and out of lungs.
Swelling makes the airways narrow so it is harder to breath, airways make more mucus than normal which makes breathing harder.



Causes
Asthma is caused due to a combination of environmental and genetic (inherited) factors. uIt may occur randomly or after exposure to a trigger.
Common asthma triggers include:
-Airborne substances, such as pollen, dust mites, mold spores, pet dander, smoke.
– Respiratory infections, such as common cold.
– Cold air.
– Certain medications, including beta-blockers, aspirin, ibuprofen, naproxen etc.
– Allergic reactions to some foods, such as peanuts or shellfish.



Risk factors
-Having a blood relative with asthma.
-Having allergic condition such as atopic dermatitis or allergic rhinitis (hay fever).
-Being overweight.
-Being a smoker.
-Second hand smoker.
-Exposure to exhaust fumes or pollution.
-Exposure to occupational triggers, such as chemicals used in farming, hairdressing and manufacturing.





What is an asthma attack?
-Dust, smoke and other irritating substances may trigger an asthma attack, which includes wheezing, coughing, trouble breathing and a tight feeling in your chest.
-Treat an asthma attack with quick-relief medicine, which comes in a form of handheld device called an inhaler.





What is an asthma inhaler?
Asthma inhalers are handheld devices that deliver medication directly  to the lungs.
There are two different kinds:
Metered – dose inhalers:  it consist of a pressurized canister that contains the medicine and a mouth piece. Pressing down on the inhaler releases a mist if medicine that breathe into lungs.
Dry powder inhalers: the medicine is inhaled by deep, fast breathe through the inhaler.