Asthma is usually hereditary hence your respiratory system has a tendency to react more to allergens in environment.
Take your medicines regularly as advised by your doctor.
Next Steps
An allergy test may be done ro find out your allergies, so you can avoid them effectively
Health Tips
People with asthma have tendency to develop certain fungus sensitivity(ABPA) which can cause problems to increase from your usual frequency and become more difficult to control.
Stress is also a factor