Asthma allergens exist in many daily lives and can be roughly divided into the following types: 1, allergens in food, daily contact with food, including protein, fiber, etc., can become allergens for patients with special physiques, such as crabs, shrimp in common seafood and egg yolk, which are the most commonly contacted in life, can be used as allergens in food and stimulate patients over time to induce Asthma attacks; 2, allergens in the air, because the respiratory tract needs to contact the air, inhaling air and exhaust gas, some substances in the air, such as pollen, dust mites, mold spores and mycelium, etc. inhaled into the airway, can be used as allergens to stimulate the onset of asthma patients; 3, cold air in winter, cold is a stronger allergen, the respiratory tract likes warm, moist environment, cold as a strong allergen can stimulate Respiratory tract vasoconstriction, congestion and edema; 4, various pathogenic microorganisms, such as viruses and bacteria, etc. Viruses and bacteria can be infected through the respiratory tract when the physique is poor, triggering asthma attacks.