Allergies start with an overreaction by your immune system to a normally harmless substance, such as pollen, dust, or pet dander. This overreaction can cause inflammation in the skin, sinuses, airways, or digestive system.
The specific allergens that trigger allergies vary from person to person and can change over time. For example, some people develop allergies early in life, while others may develop them later in adolescence or adulthood.
Here are some common triggers for allergies:
- Pollen from grass, weeds, and trees: These are major triggers for seasonal allergies, often referred to as hay fever.
- Mold: Mold spores can be found indoors and outdoors, especially in damp environments.
- Dust mites: These tiny creatures live in dust and can trigger allergies, especially in homes with carpets and bedding.
- Pet dander: Pet dander is made up of dead skin cells, saliva, and urine from animals.
Note: The original question was incomplete. It should have been "What do allergies start with?" for a complete and accurate answer.
