by European Alliance of Associations for Rheumatology (EULAR) Credit: Unsplash/CC0 Public DomainHemophagocytic lymphohistiocytosis (HLH) and macrophage activation syndrome (MAS) are life-threatening systemic hyperinflammatory syndromes. Systemic hyperinflammation and HLH/MAS can occur in nearly any inflammatory state, but there are certain predisposing conditions and inflammatory triggers. This includes rheumatic diseases, malignancies, metabolic diseases, and genetic immune problems....
