Allergic asthma is the most common kind of asthma — nearly 6 out of 10 people with asthma have allergic asthma. People with allergic triggers may be able to improve their health by reducing their exposure to common allergens, like pollen, dust mites and mold. This means staying inside on days when pollen counts are especially high, as well as taking steps to allergy-proof your home. Taking antihistamines or other medications can also help to ward off allergic asthma symptoms.