How are allergies and asthma different?

Many things. Allergies are an immune response of the body to a foreign substance that causes release of certain chemicals in the body like histamine. Asthma can be triggered by an allergic reaction but not always (exercise, cold air, etc).

Related Questions

How are an allergy and asthma attack different?

Allergy vs asthma. There are multiple triggers of asthma attacks including: colds, exercise, aspirin, cold air, sinus infection, acid reflux, air pollution, and allergies. About half of adults with asthma have an allergic trigger, while 80-90% of kids with asthma have allergic trigger to their asthma. Allergic reactions can affect nose and eyes without affecting lungs. If it leads to lung inflammation, it's asthma. Read more...