Mr. Li, 48 years old.
He had asthma for 47 years. He received injections to ease the symptoms when he was young. As he grew older, he took medication regularly. Unfortunately, his asthma was getting more serious with age. Especially at night, he had trouble sleeping caused by shortness of breath, coughing and wheezing. He also had the feeling of chest tightness. In addition, his throat was itchy all the time. Furthermore, he had to rest many times when walking up the stairs to his 7th floor unit (no elevator).