There are two types of asthma, intrinsic asthma and extrinsic asthma. Internal factors like stress, air pollution, respiratory infection and exercise cause intrinsic asthma. Animals dander, pollens, trees, molds, dust mites etc causes extrinsic asthma.
https://youtube.com/playlist?list=PLlQYIZVKg-48qpS-X7WXV4HWqDuy8sGEe
Tag: types
Site Title 