asthma
Asthma is a chronic condition that affects the respiratory tracts (airways) that carry air from the lungs and are characterized by difficulty breathing frequently.
This disease consists of three important elements
- Chronic inflammation of the respiratory tracts and the presence of white blood cells of various types are neutrophils, lymphocytes, eosinophils, lymphocytes, neutrophils, and the presence of cells that produce cytokines and mast cells (mast cells) in addition to the enlargement of the muscles planned in the wall of the duct and the increased mucus production of mucous cells.
- Hypersensitivity which appears in the form of narrowing in the respiratory tract due to exposure to different stimuli.
- Stenosis or obstruction of the respiratory tract, which is a reversible factor automatically or with treatment.
During the latter part of the last century there has been a steady increase in countries that depend on Western lifestyle as well as in developing countries, as current estimates indicate that 300 million people worldwide suffer from asthma.
By 2025, an additional 100 million people with asthma can be diagnosed with an increase of up to 15 percent, especially in children and young adults, and are more prevalent in developed countries such as the United Kingdom, New Zealand and Australia, as well as developing countries.
In childhood, male children are more exposed than females, and in post-puberty the most affected are females.
Oxford handbook of clinical medicine 8th edition
Dvidson’s principles and practice of medicine 21st edition