Causes & Triggers
Know your allergy triggers so you can avoid them
The things that cause your allergy symptoms are called your triggers. Know your triggers, so you can avoid them. Common allergy triggers include the following:
Indoors:
- Pets. Dogs, cats, and other animals shed tiny flakes of skin called dander. Dander can cause allergy symptoms. Some people may also be allergic to an animal's saliva or urine.
- Rugs and carpets. Floor coverings often have dust mites. These are bugs so small that you can't see them. They can trigger your allergies. Many people are also allergic to dried cockroach droppings and remains.
- Beds. Dust mites and other allergens can be found in beds, including the sheets, pillows, mattresses, and box springs. Many people are also allergic to the feathers in comforters and pillows.
- Curtains and blinds. Curtains and blinds can collect dust that may have dust mites.
- Mold. Mold can cause allergic reactions. It is a type of plant that grows indoors in damp places like the bathroom. It can also grow in damp places outdoors.
Outdoors:
- Trees. Trees release pollens, which are a common cause of allergies.
- Grasses and weeds. Grasses and weeds give off pollens that cause allergies. Doing yard work can release pollens and molds into the air.