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It occurs in most people with asthma and up to 20% of people without asthma. [116] Exercise-induced bronchoconstriction is common in professional athletes. The highest rates are among cyclists (up to 45%), swimmers, and cross-country skiers. [117] While it may occur with any weather conditions, it is more common when it is dry and cold. [118]
Rates of asthma rates in 2017 [1] As of 2011, approximately 235 million people worldwide were affected by asthma, [2] and roughly 250,000 people die per year from asthma-related causes. [3] Low and middle income countries make up more than 80% of the mortality. [4] Prevalences vary between countries from 1% to 18%. [3]
Hormonal changes in adolescent girls and adult women associated with their menstrual cycle can lead to a worsening of asthma. Some women also experience a worsening of their asthma during pregnancy whereas others find no significant changes, and in other women their asthma improves during their pregnancy. [13] Psychological stress. There is ...
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Asthma is a common condition and affects over 300 million people around the world. [3] Asthma causes recurring episodes of wheezing, breathlessness, chest tightness, and coughing, particularly at night or in the early morning. [4] Exercise-induced asthma is common in asthmatics, especially after participation in outdoor activities in cold weather.
The environment can be a factor for people to develop asthma and for those who already have the condition. And climate change may make things worse.
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
In the developed world, about 20% of people are affected by allergic rhinitis, [15] food allergy affects 10% of adults and 8% of children, [16] and about 20% have or have had atopic dermatitis at some point in time. [17] Depending on the country, about 1–18% of people have asthma. [18] [19] Anaphylaxis occurs in between 0.05–2% of people. [20]