In this condition, the airway swells to make the passage narrower and excess mucus are produced. It might get difficult for a person to breathe. This may trigger shortness of breath, wheezing and coughing. Symptoms of asthma are chest pain, difficulty in breathing, cough, and wheezing. Inhalers can be treated through the use of inhalers. Steroids can be used to prevent symptoms of asthma. Oxygen therapy can be used for supportive care during the treatment of asthma.