When Your Body Reacts to Everything
Hypermobility, Histamine, and Autoimmunity: Why These Clues May Be Connected
Have you ever felt like your body reacts to… everything?
Foods you used to tolerate. Supplements. Heat, stress, hormone shifts, exercise. Random things that seem completely fine for everyone else.
Maybe you're also super flexible (or were as a kid), bruise easily, have joint pain or instability, deal with gut issues, or have been told you have an autoimmune condition.
Or maybe you're dealing with flushing, itching or hives, headaches, digestive issues, a racing heart, nasal congestion, or reactions to foods that seem completely unpredictable.
And somehow, all of these things have been treated like completely separate issues.
If you're reading this thinking, "Wait… this sounds like me," keep reading.
So why can these things overlap?
This is something I find so interesting.
Connective tissue disorders and hypermobility, mast cell and histamine issues, and autoimmune conditions are different things. Having one absolutely does not mean you have the others.
But clinically, we do see overlap, and researchers are still working to understand exactly why.
One piece of the puzzle may be that connective tissue, mast cells, and the immune system aren't operating in completely separate lanes. Mast cells actually live throughout connective tissue. They're immune cells that release histamine and many other inflammatory mediators when activated.
So when someone has a system that seems to "run hot" (highly reactive, inflammatory, sensitive to changes), we get curious about what may be contributing, rather than assuming every symptom needs its own separate explanation.
Where genetics comes in
This is where genetics gets really interesting.
There isn't one "MCAS gene" or one genetic test that explains this entire picture. (I wish biology were that easy!) Instead, we can look at different genes and pathways:
Connective tissue: Genes in the COL family, among others, are involved in collagen and connective tissue structure. Importantly, hypermobile EDS still does not have a single established genetic cause for most people, so a negative genetic test doesn't automatically rule out hypermobility-related concerns.
Histamine: Genes including DAO and HNMT are involved in how the body metabolizes histamine.
Other related pathways: We can also look at genetic pathways related to inflammation, blood pressure, glucose and insulin, and celiac risk.
Genetic results are one piece of information. They aren't a diagnosis on their own, but alongside your symptoms, history, and labs, they can give us direction.
Your genes aren't the whole story
Then we have all the other pieces that influence how these pathways behave: hormones, gut health, infections, nutrient status, stress, medications, environment, and more.
This is why two people can look similar on paper and need very different support.
The bigger picture
There is no one-size-fits-all here. This is about knowing your version.
The goal isn't to collect diagnoses. It's to understand your body better.
If someone is hypermobile, reactive to foods and supplements, dealing with unexplained inflammatory symptoms, and has a personal or family history of autoimmunity or similar symptoms, we don't want to look at each clue in isolation. We want to step back, see how the pieces fit together, and build support that makes sense for you.
You deserve care that looks at the whole picture, not just one symptom at a time.
Does this sound like you?
