If your asthma is difficult to control, it may be a sign of a more severe type, called eosinophilic asthma. Here’s what you should know.
Shown: computer illustration of eosinophil white blood cells. About 50 percent of people with severe asthma may have elevated levels of eosinophils in their blood.
Asthma treatment is no longer one-size-fits-all. That’s because research is uncovering new asthma subtypes and treatments that can be tailored to each specific type.