Asthma is a condition that blocks the respiratory airways which causes difficulty in breathing. In severe conditions, asthma can make it difficult for you to perform even regular activities. Common symptoms of this inflammatory disease include difficulty in breathing, coughing, sneezing, weakness, congestion in the chest. The most common and harmful factor that causes asthma is exposure to allergens. Each individual might have different triggers, some of the common triggers include dust, pollen, strong odor, smoke, animal dander, temperature, etc. You might be surprised to know the uncommon triggers of asthma here!