The reason why some people think that asthma is an allergy is that they can have similar symptoms as well as triggers. For example, dust, pollen, or pet dander can trigger both an allergic reaction as well as an asthma attack. Additionally, allergies and asthma can also happen at the same time3. Statistically, people with allergies are also more prone to having asthma, which might be the reason why people associate the two fairly often.
However, asthma itself is indirectly allergy. It’s more of the body’s response to certain stimuli, which in this case, are asthma triggers. Their symptoms can also be different, as a runny nose and sneezing is not typically a symptom of asthma, but it is a symptom of an allergic reaction.