<unk>  <unk>  is one type of<unk> <unk><unk>  disorder (MCAD), and is an immunological condition in which<unk> <unk> s inappropriately and excessively release chemical mediators, resulting in a range of chronic symptoms, sometimes including anaphylaxis or near-anaphylaxis attacks. Primary symptoms include cardiovascular, dermatological, gastrointestinal, neurological and respiratory problems. Unlike<unk> ocytosis, another type of MCAD, where patients have an abnormally increased number of<unk> <unk> s or abnormally shaped<unk> <unk> s, patients with<unk>  have normally shaped<unk> <unk> s and can have a normal number of<unk> <unk> s that do not function properly and are defined as "hyperresponsive".<unk>  is still a poorly understood condition and is a current topic of research.
Mast cell activation syndrome
CREST syndrome
Cytokine release syndrome
MOMO syndrome
SUNCT syndrome
Macrophage activation syndrome
Systemic inflammatory response syndrome
OSLAM syndrome