Macrophage Activation Syndrome (MAS)
Macrophage Activation Syndrome is triggered by an underlying health issue, such as an autoimmune or autoinflammatory disease. It often occurs in those who's underlying disease is newly diagnosed or very active, but can also happen with some infections even if the disease is well managed.
What causes MAS?
- Triggered by an autoimmune or autoinflammatory disease.
- Seen most in patients with Still's Disease, including sJIA, and Lupus, but it can happen in other autoimmune and autoinflammatory diseases.
- Mostly occurs in those with active disease (flaring) or undiagnosed
- Infections are also a common trigger
Patient-led education on Macrophage Activation Syndrome was made possible by the financial support of Sobi.
Patient Guide
FREE e-Book written by patients for patients (and medically approved by professionals)
Healthcare professional brochure
Print this brochure (or share this webpage) and bring to your health professionals
Check out these stories from Katelyn and Jenny, 2 patients who have experienced and recovered from MAS.
Katelyn's MAS Story
What Surprised Katelyn About MAS
What Katelyn Wants Patients to Know About MAS
Jenny's MAS Story
What Surprised Jenny About MAS
What Jenny Wants Patients to Know About MAS
MAS Educational Social Media Posts
Understanding MAS
Warning Signs of MAS
Diagnosing MAS
Treating MAS
Other MAS Resources
Check out these great resources to learn more about Macrophage Activation Syndrome