September 8th, 2009 
Von Asthma is a chronic lung disease. It’s inflames and narrows the airways. Asthma causes a whistling sound when you breathe, chest tightness, shortness of breath, and coughing. The coughing often occurs at night or early in the morning. Asthma affects people of all ages, but it most often starts in childhood. Asthma affects 7% of the population, and 300 million worldwide. Nearly 100 million of these people are children. During asthma attacks, the smooth muscle cells in the airways constrict, and the airways become inflamed and swollen and breathing becomes difficult. Public attention in the developed world has recently focused on asthma because of its rapidly increasing prevalence, affecting up to one in four urban children.
Asthma Day
In every year mid of the year 6th May is celebrated as Asthma day throughout the world. This day makes all the patients feel appreciated and cared for after a year long of suffering. The organizations such as Gina and WHO dealing with this condition come up with different programs making people aware of the condition and suffering of these patients.
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Symptoms of Asthma
Though symptoms may be very severe during an acute exacerbation, between attacks a patient may show few or even no signs of the disease.The breathing tubes of a person suffering from asthma are sensitive and they react with smoke, pollen, dust, air, pollution, allergies or other triggers. Symptoms of an asthmatic episode include wheezing, nighttime coughing, shortness of breath with exertion but no dyspnea at rest, prolonged expiration, a rapid heart rate (tachycardia), and rhonchous lung sounds (audible through a stethoscope).
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Reason of Asthma
Asthma is caused by environmental and genetic factors, which can influence how severe asthma is and how well it responds to medication. Some environmental and genetic factors have been confirmed by further research, while others have not been.
* Environmental
Many environmental risk factors have been associated with asthma development and morbidity in children, but a few stand out as well-replicated or that have a meta-analysis of several studies to support their direct association.
* Genetic
Over 100 genes have been associated with asthma in at least one genetic association study. However, such studies must be repeated to ensure the findings are not due to chance. Through the end of 2005, 25 genes had been associated with asthma in six or more separate populations.
* Gene–environment interactions
Research suggests that some genetic variants may only cause asthma when they are combined with specific environmental exposures, and otherwise may not be risk factors for asthma.
* Socioeconomic factors
The incidence of asthma is highest among low-income populations (asthma deaths are most common in low to middle income countries.
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