What are the signs that asthma is getting worse?

It is very important for asthma sufferers to closely monitor their peak flow readings, which measures how much air they can expel from their lungs. If peak flow meter readings drop 20% or more, then the asthma sufferer should consult a physician. Other signs of worsening asthma include the need to use a medicine more often and the development of symptoms at night when none previously existed.