Typically considered a chronic or ongoing condition that requires management for the rest of your life.

Important note: there are many types of asthma. Allergenic, non-allergenic, occupational, nocturnal, exercise-induced...

Some types do go away. Don't hold your breathe for this to work for you.

Example (1): pediatric asthma affects about 1 in 2 children, but does not persist beyond about age 15 and it continues through to about 1 in 5 adults.

Example (2): occupational asthma is usually from an irritant in the workplace. If you change jobs, you have removed the trigger and won't show symptoms. In some cases, by removing the irritant for long enough, it gives your lungs time regrow whatever damage was done by the irritant; same time, in other cases the lungs aren't damaged because it's a sensitivity to something specific, or the material/chemical has irreparably damage the lung tissue.

Example (3): allergenic asthma can be outgrown, or in some cases it is possible to receive medical treatment to train your body not to respond to those allergens (or at least have a higher threshold).

A person can learn to modify their behaviour to avoid triggers. That isn't quite remission in the same way it is defined for cancer.