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03

Mast cells and immune signalling

Tissue-resident alarm cells that sit at every barrier in the body.

SinusesAirwaysGut liningPelvisSkinMast cellsIgA layer
On guardStanding downMast cellsIgA layer

A schematic, not to scale — the places this mechanism works.

Part one — how this normally works

Sentinels in the tissue, not the blood

Mast cells live in skin, gut, airway, bladder and pelvic tissue — wherever the outside world meets the inside. They carry pre-made granules of histamine, tryptase, heparin and cytokines and release them within seconds of a trigger.

Degranulation is useful

Release makes vessels leaky so immune cells can reach tissue, recruits repair, and makes the area sore enough to protect. This is ordinary wound healing and ordinary defence.

Mast cells talk to nerves

Mast cells sit directly against small nerve fibers and signal both ways: nerves can trigger release, and mediators sensitize nerves. This is a normal feedback loop, not a malfunction.

Part two — what varies between bodies

  • Trigger thresholds vary widely — heat, friction, alcohol, stress, hormones and certain foods all lower them.
  • Estrogen increases mast-cell activity; progesterone tends to damp it, so reactivity can track the cycle.
  • Mediator half-lives are short, which makes laboratory confirmation genuinely difficult.

Part three — where it diverges

This is the first place conditions get named

  • When release happens repeatedly to ordinary stimuli, across two or more organ systems, and responds to mediator-blocking treatment, that pattern is described as mast cell activation syndrome.
  • Mast-cell density is elevated in endometriotic lesions and in the bladder wall in interstitial cystitis, tying immune signalling to pelvic pain.
  • Mediators drop blood pressure and drive tachycardia, overlapping the autonomic picture directly.
  • Post-viral immune activation appears to leave some of this loop switched on.

What moves this mechanism

  • Identify and reduce the reliable triggers rather than chasing every possible one.
  • H1 and H2 blockade and mast-cell stabilisers, trialled deliberately with a defined endpoint.
  • Treat what is amplifying release: sleep loss, deconditioning, untreated pain.
  • Expect cycle-linked variability rather than reading it as inconsistency.

Conditions that involve this mechanism