PubMed
Hives in autonomic disorders: a cutaneous marker of a distinct symptom phenotype.
potsdysautonomiamast cellmcas
Mast Cell Activation Syndrome causes recurrent multi-organ symptoms due to mast cell mediator release.
✦ AI summary
Mast cell activation syndrome (MCAS) shows up across several conditions and comes with a very wide, sometimes confusing symptom picture. In people with POTS or related dysautonomia, hives are common (about 60% report them at least sometimes) and are linked to more severe overall symptoms like GI, bladder, and vasomotor issues, though not specifically to orthostatic symptoms [1]. It's also frequently reported alongside joint hypermobility conditions (like hEDS) and Chiari malformation, often clustering with POTS as part of a broader connective-tissue/dysautonomia picture [2][12]. A large survey of people who self-identified or were diagnosed with suspected MCAS found extremely varied symptoms, with classic mast-cell skin signs (itching, hives, flushing, swelling) actually reported relatively infrequently, and many participants also had notable anxiety, depression, or reduced quality of life; researchers cautioned that other more treatable conditions should be ruled out first [7]. Some overlap conditions exist too, like chronic urticaria patients who have anaphylaxis-like flares (distinct from true MCAS) [4], and reviews note that non-IgE mechanisms (like MRG
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