aHUS atypical Hemolytic Uremic Syndrome (aHUS) website

What is aHUS?

What is aHUS?

aHUS is a rare disease where the complement system, a part of the immune system, is always activated, leading to damage of organs throughout the body1,2

Atypical Haemolytic Uraemic Syndrome (aHUS) is a rare, life-threatening, genetic disease. It can damage vital organs such as the kidneys, heart and brain.2,3

Almost one-half of people
affected with aHUS are adults1,2

Although aHUS does affect children, almost one-half of people affected are adults.1,2

In aHUS, the complement system (part of the immune system) is uncontrolled. It is always active (on) and can attack the body it normally protects.4

Damage from the uncontrolled complement system is known as systemic thrombotic microangiopathy (TMA). If your complement system is uncontrolled, cells along blood vessel walls become damaged. Platelets become overactive and blood clots form in tiny blood vessels throughout the body.

Clots can block blood flow, create inflammation, and travel to other organs, causing further damage.4,5,6

  • The uncontrolled complement part of the immune system causes abnormal clotting and inflammation
  • This results in damage to tiny blood vessels
  • The damage that occurs throughout the body is known as TMA
  • TMA can lead to problems in kidneys and other vital organs



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