My father (age 61) has been rushed to the hospital twice within the past 6 months due to under going a severe asthma attack. They have checked his lungs, heart, and chest and continue to say that everything looks perfectly fine. Though this may be the case, it  is unsettling not knowing exactly what can cause an attack and then his inhaler alone cannot fix this problem. Any advice or suggestions?
Pulmonary function test can be done avoid allergens like dust, food etc inhaler can be used if it is not sufficient to consult the pulmonologist change the inhaler CT CHEST is also advisable