Synonyms: Familial HLH
Familial Hemophagocytic lymphohistiocytosis (FHL) is a rare primary immunodeficiency characterized by a macrophage activation syndrome (see this term) with an onset usually occurring within a few months or less common several years after birth.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version April 2026
Newly diagnosed with
Familial hemophagocytic lymphohistiocytosis?
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Advocacy Organizations
Immune Deficiency Foundation
To improve the diagnosis, treatment and quality of life of people affected by primary immunodeficiency.
Immunocompromised Association
Immunocompromised Association promotes awareness, education, and support for immunocompromised individuals to reduce their inherent health risks in the community.
The AIP BIPOC Network
Our mission is to improve the quality of life of the BIPOC Autoimmune Community through Awareness, Advocacy, Action, Assessment and Access.
The Dynamite Foundation Inc
The Dynamite Foundation is on a heartfelt mission: to bring love, hope, and joy to individuals impacted by Histiocytosis around the world We do this through Dynamite the Histio Warrior Dragon™; a handcrafted crochet dragon sent to Histio Warriors in the midst of their battles, and to Angel Families remembering their loved ones through Angel Dynamite.
Ukrainian Association of Pediatric Immunology
Development of pediatric and clinical immunology in Ukraine. Raising awareness of inborn errors of immunity in Ukraine and rare immune diseases; Advocacy campaigns supporting patients with rare immune diseases and their treatment plans; Scientific research; Sharing knowledge about immunoprophylaxis; Advocacy campaigns supporting immunoprophylaxis.
accessia health
Accessia Health, a national charitable patient assistance organization, is dedicated to eliminating healthcare barriers for people with rare or chronic health conditions. Comprehensive services include personalized case management, financial assistance, education, and legal aid support. Our flexible funding model goes beyond copays, allowing individuals to pay for other essential medical expenses
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Clinical Trials
For a list of clinical trials in this disease area, please click here.