How would i be able to tell when i have asthma?

Testing: A lot of different medical problems have similar symptoms to asthma. The best way to confirm the diagnosis is with a methacholine challenge test - a special type of pulmonary function test. Your breathing is tested while a therapist gives you an inhaled medication called methacholine. In patients with asthma, this will cause the airways to spasm at low doses - a "positive" test.

Asthma symptoms: The common symptoms of asthma are recurrent: cough, wheezing, shortness of breath, and chest tightness. Some people have all of these symptoms and some just have 1. These symptoms typically get worse at night, with exercise and with colds. If these symptoms occur, see an asthma specialist such as allergist or pulmonologist for lung function testing.