Asthma affects the airways making them over sensitive to things such as cold air, dust, pollen etc. and causes the airways to tighten making breathing more difficult. It may be linked to allergies and skin conditions such as hay fever and eczema.
Most common of these are inhalers; relievers (usually blue) and preventers (usually brown, red or orange). It’s very important to take your inhalers the way they have been prescribed and that you know how to use them properly.