The recent research has shown that difference in sex affects asthma.

The study researchers from Harvard Medical School have found that boys are able to shed their asthma symptoms when they reach their teens.

The scientists also found that percentage of boys shedding symptoms of asthma in teens is much higher than girls. But, it is also a fact that Boys suffering from asthma are more likely than girls to wheeze in childhood.

The researchers analyzed the data collected from 1,000 kids over a period of nine years. Researchers noted lung functions of these kids aged between five and 12. The kids suffered from mild to moderate form of asthma in the beginning of the study. Based on the annual reports on lung functions, these kids were given different dosages of a drug to cause narrowing of the airway.

The researchers discovered that amount of drug required for girls remained standard for long time. However, bigger and bigger doses were needed year on year for boys. This showed that severity of asthma in boys was decreasing. The study showed that by the age of 18, only 14% of the girls did not react to the drug, compared with 27% of boys.

Dr Tantisira, the lead researcher said: "While our results were not unexpected, they do point to intriguing potential mechanisms to explain the gender differences in asthma incidence and severity.

"Especially intriguing is that the differences in gender begin at the time of transition into early puberty."

Leanne Male, from Asthma UK added that this study is particularly exciting as it provides an insight into the mechanisms involved in asthma development during the transition period between childhood and adulthood, demonstrating how we can influence these processes and develop new targeted therapies. Hormones can play a key role in influencing asthma symptoms and severity, suggesting that gender is an important factor in asthma development.