Understanding hypereosinophilic syndrome (HES)

When you have HES, your blood eosinophil count is elevated

Eosinophils (ee-uh-sin-uh-fils) are a type of white blood cell that is a normal part of your immune system.
Elevated eosinophils in your blood can lead to inflammation. This inflammation can worsen your symptoms and cause an HES flare.

HES affects people differently

The symptoms someone experiences depend on which parts of the body are being affected. Symptoms could include a general feeling of being unwell, like tiredness. It’s likely that you may experience only some HES symptoms, and your symptoms may also change over time.

Symptoms can affect any part of your body, including:

  • Lungs

  • Heart

  • Stomach & intestines

  • Skin

  • Brain & nervous system

Without treatment, symptoms of HES can become increasingly worse.

It’s important to talk with your doctor about all of your symptoms.

Your doctor can determine which symptoms may be related to HES.

Talk to your doctor


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