People should know the causes of their asthma symptoms and try to avoid these triggers.

VOA: special.2009.07.28

Many migraine sufferers say hot weather and low barometric pressure can act as triggers.

VOA: special.2009.03.18

Triggers are things that cause the asthma sufferer's airways to swell.

VOA: special.2009.07.28

Food additives like salt and monosodium glutamate also may be triggers.

VOA: special.2011.05.03

Different people are affected by different triggers.

VOA: special.2009.07.28

So if we can get better at giving people triggers of when to leave early, which we will work very hard on doing, then people evacuating themselves is the safest thing to do as long as it's early enough."

VOA: standard.2009.06.24