About 80% of those with asthma have allergies to substances such as pollen, animal dander, mold, dust mites, and even trees or grass.
Various Foods and Food Additives
Individuals with food allergies may exhibit asthma due to food-induced anaphylaxis. Some of the more common foods are eggs, milk, shellfish, peanuts, wheat, among others. Various sulfites used in food preservation may trigger symptoms in sensitive individuals.
Smoking and Secondhand Smoke
Smokers are more likely to get asthma. Patients who already have asthma and smoke, this will make symptoms much worse.
Pollution and Other Airborne Irritants
Air pollution, cleaning agents, smoke from burning wood, factory dust particles, and even strong perfumes can trigger an attack.
Sinusitis and Other Respiratory Infections
When sinuses become inflamed, post nasal drip may lead to inflammation in the lungs as well, and may exacerbate the condition.