If you believe you have asthma. If you have persistent cough/wheezing that does more than some days/any other symptoms of asthma, see your expert doctor. Managing asthma early may limit long-term lung injury and better keep the situation from worsening over the past. To control your asthma after investigation. If you understand you have asthma, work with your physician to keep it below control. Good long-term power helps you feel more normal every day and can prevent a life-threatening asthma assault.