Learn to recognize the early warning symptoms of an attack. Find out how to use relaxation techniques and methods for controlling breathing and coughing when you feel an attack coming on. Asthma occurs when something in the environment stimulates the immune system to an allergic reaction of the air passages. These passages close. Such reactions are useful in protecting the lungs from foreign dust or chemicals, but in asthma there is an over-reaction to substances that are normally harmless.
Breathing is impaired.