Exercise-induced asthma is characterized by a transient rise of the airways resistances, associated with asthmatic symptoms, 5 to 10 minutes after the end of a submaximal effort. The treatment is based on a pre-effort warming, cover the mouth with a mask (when the weather is cold), the use of beta-mimetic bronchodilators before exercise and, chronic treatment with antiinflammatory drugs. When the patient is not controlled, an evaluation of the lung function is required with a postbronchodilator control or an exercise challenge test. If the patient remains uncontrolled despite the treatment, others diagnostics should be excluded, such as vocal cords dysfunction or left heart failure.