The Invisible Hits: What Actually Costs Energy in an EDS/MCAS/POTS Body

The standard list: sleep, hydration, rest, pacing, and don’t overdo it, is not wrong… It is just incomplete in a way that makes some people feel unseen. It describes the remedies without describing the problem, and the problem is that there are dozens of variables draining the account that nobody outside this community knows to count. Some of them have no name yet. Some of them have names that sound made up to people who don’t have them.

What follows is an attempt at a real list of energy expenditures — the things that cost, that outsiders would never recognize as costs, drawn from the research, from the educators who live in these bodies, and from the community knowledge that has been circulating in patient spaces for years before any of it made it into a journal.

I. The Structural Tax: What It Costs Just to Hold a Body Together

1. The metabolic cost of walking is measurably higher. This is a documented physiological finding: A 2025 study published in Frontiers in Rehabilitation Sciences (Ladell et al.) found that people with hEDS and HSD have a significantly higher metabolic cost of walking at the same speed as controls — driven not by increased plantar flexor work but by a redistribution of joint work to more proximal joints. The body is compensating for lax connective tissue by recruiting larger, more expensive muscle groups to do work that ligaments are supposed to do passively. Walking costs more. Not metaphorically but calorically.

2. Sitting still costs more. Jeannie Di Bon, movement therapist and person with hEDS, has documented this clearly: in most bodies, ligaments provide passive stability with minimal energy use. In hypermobile bodies, muscles must actively contract to hold joints in position. The body “hangs into” postures — locking knees, dropping into one hip, collapsing the chest — because it is running a fatigue strategy. It is choosing the least expensive option available. Forcing “good posture” without building the underlying capacity first is an additional energy expenditure layered on top of an already depleted system.

3. Bracing patterns run continuously and invisibly. Frequent bracing — the unconscious co-contraction of muscles to create stability that connective tissue is not providing — expends significant energy and, critically, interferes with breathing patterns. Disordered breathing then compounds fatigue through its own cascade. Jeannie Di Bon identifies this as one of the primary underrecognized contributors to fatigue in hEDS/HSD that is not captured in standard fatigue models.

4. Proprioception is impaired, and the nervous system is working overtime to compensate. Research confirms that EDS patients show significantly impaired proprioceptive precision — the sense of where joints are in space. The nervous system compensates by increasing vigilance: more sensory processing, more constant recalibration, more cognitive and neurological overhead just to navigate a room without falling. This reads like anxiety, bit it is actually a structural navigation deficit that has a real metabolic cost.

II. The Autonomic Tax: What It Costs to Be Upright

5. Gravity is a variable. In a POTS body, the simple act of being vertical triggers an abnormal cardiovascular response. The heart rate increases by 30 beats per minute or more just on standing. The body is fighting gravity every moment it is not horizontal. This is fatigue from being upright: Showering, standing at a counter, waiting in a line, attending a social event- all of these have a gravitational surcharge that does not exist for people with a normally functioning autonomic nervous system.

6. Eating is a cardiovascular event. In POTS, eating a meal — particularly a large or high-carbohydrate one — causes blood to pool in the splanchnic (gut) circulation. The heart rate spikes and blood pressure can drop. The body has to work to redistribute blood volume while simultaneously digesting. This is called postprandial hypotension and postprandial tachycardia, and it is well-documented in POTS literature. The community shorthand is “food hangover.” The clinical reality is that every meal is a physiological negotiation.

7. Temperature regulation is not automatic. Thermoregulation — the body’s ability to maintain core temperature — is an autonomic function. In dysautonomia, it is dysregulated. Jeannie Di Bon’s work on heat intolerance in EDS documents this: the body works to maintain temperature within a narrow range, and when that process is disrupted, it costs energy. Heat exposure, cold exposure, transitions between environments, humidity — all of these are variables that a regulated autonomic nervous system handles quietly in the background. In a dysautonomic body, they are foreground events that require active management and deplete reserves.

8. Digestion is slow and expensive. Gastroparesis — delayed stomach emptying — is common in EDS due to pooling, nerve dysfunction, and weak digestive muscles. Slow digestion means the body is spending extended time and energy processing food that has not moved. Nausea, bloating, and fatigue after eating are the cost of a digestive system that is working against poor motility. MCAS adds another layer: mast cells in the gut lining can be activated by food, releasing mediators that cause inflammation, cramping, and systemic fatigue.

III. The Immune Tax: What It Costs When the Mast Cells Are Running Hot

9. Every exposure is a potential activation event. In MCAS, mast cells are primed to respond to stimuli that would not register in a non-MCAS body: fragrance, food additives, temperature change, pressure change, infection, certain medications, adhesives, dyes, and stress hormones. Each activation event releases a cascade of mediators — histamine, tryptase, prostaglandins, leukotrienes — that trigger symptoms and require the immune system to respond and recover. The recovery from a mast cell activation event is not instantaneous. It has a cost, and that cost compounds across a day of multiple small exposures.

10. Histamine load is cumulative and invisible. The histamine bucket is not a metaphor — it is a functional model of how histamine accumulates in the body faster than it can be cleared, particularly when DAO enzyme activity is low (common in MCAS). A food that was fine yesterday may not be fine today if the bucket is already full from other sources: pollen, stress, hormonal fluctuation, a fragrance in the elevator. The outsider sees someone reacting to something random. The person with MCAS is managing a running total that nobody else can see.

11. The mast cell–stress hormone loop. Corticotropin-releasing hormone (CRH) — the stress hormone released at the start of the HPA axis stress response — directly activates mast cells and triggers degranulation. This is documented in peer-reviewed literature (IFM, 2025; multiple PMC sources). A stressful conversation, a difficult medical appointment, an unexpected piece of bad news — these are not just emotionally taxing. They are immunologically activating. The sharp word that broke you out of your safe zone is a literal mast cell trigger.

IV. The Hormonal Tax: What It Costs When the Endocrine System Is in the Mix

12. The menstrual cycle is a variable, and perimenopause is a multiplier. Estrogen stimulates mast cells to release histamine. Progesterone, which normally has a mast-cell-stabilizing effect, drops first in perimenopause — before estrogen does. The result is a period of elevated mast cell reactivity that can last four to ten years. This is more than mood instability. It is a documented neuroimmune shift. For people with MCAS and hEDS, perimenopause is not just a hormonal transition; it is a period during which the baseline threshold for activation drops and the energy cost of existing rises. The luteal phase of the menstrual cycle — when progesterone peaks and then crashes — is consistently associated with increased joint laxity, POTS symptom worsening, and MCAS flares.

13. The estrogen patch that falls off is not a minor inconvenience. For people with hEDS and MCAS adhesive reactivity, transdermal hormone delivery is complicated by skin extensibility and contact reactions. A patch that fails to adhere means a day of hormonal deficit that has downstream effects on mast cell stability, joint laxity, autonomic tone, and energy. This is a real variable. It does not appear on any standard energy management list.

V. The Neurological Tax: What It Costs to Process the World

14. Sensory processing is amplified and expensive. Research by Dr. Jessica Eccles has established that neurodivergent people are more than twice as likely to have hypermobile joints, and that hypermobile individuals show heightened sensory processing sensitivity — amplified responses to light, sound, texture, temperature, and pain. This is a neurobiological trait with a physiological cost: A crowded room, a fluorescent light, a scratchy tag, a loud conversation — each of these is processed more intensely and requires more neurological resources to manage. The sensory environment is an energy variable.

15. Cognitive load is a physical event. Jeannie Di Bon notes that she had no idea, when first diagnosed, that mental fatigue could trigger a physical flare. She thought it was purely physical activity. It is not. In bodies with ME/CFS overlap (common in hEDS) and in POTS, cognitive exertion — sustained concentration, complex decision-making, emotional processing, reading, writing, navigating a difficult conversation — can trigger post-exertional malaise indistinguishable from physical overexertion. The brain is a metabolically expensive organ. In a body where energy is already constrained, it competes directly with every other system.

16. Decision fatigue is compounded by the complexity of managing these conditions. Every day involves dozens of micro-decisions that a healthy person does not have to make: Can I eat this? Will this fragrance trigger me? Do I have enough energy to shower before this appointment, or do I save it? Should I stand or sit? Is this new pain something to act on? This is the cognitive overhead of managing a body with a narrow margin of error. It is real work, and it depletes the same reserves as physical work.

17. Brain fog is not vagueness. It is a physiological state. Histamine crosses the blood-brain barrier and affects cognitive function. Orthostatic hypotension reduces cerebral perfusion. Mast cell mediators cause neuroinflammation. The result — described by the Zebra Club community as “sometimes I have to close my eyes to speak so I can put my words together” — is a documented neurological state, not a character trait. It has a cost and it has triggers, and those triggers are often invisible to everyone in the room.

VI. The Social and Emotional Tax: What It Costs When the World Doesn’t Understand

18. A sharp word costs the same as a barometric pressure drop. The autonomic nervous system does not distinguish between a physical threat and a social one. Both activate the sympathetic nervous system. Both trigger a stress hormone cascade. Both can activate mast cells. In a body where the autonomic nervous system is already running in a dysregulated state — already closer to the edge — a dismissive comment from a doctor, a misunderstanding with a partner, a moment of feeling unseen or disbelieved, lands in the same register as a physical stressor. Sometimes harder, because there is no recovery protocol for it.

19. Medical appointments are not neutral events. The EDS Society’s fatigue data identifies “dissatisfaction with the diagnostic process and availability of management options” as one of the top five predictors of fatigue severity in hEDS. Jeannie Di Bon lists “the stress and anxiety of living with a chronic illness, plus the fear of attending medical appointments or appointment overwhelm” as a direct fatigue trigger. A medical appointment — particularly one with a provider who does not understand these conditions — is an activation event. The preparation, the travel, the performance of being believed, and the recovery afterward: all of it costs.

20. The diagnostic odyssey has a running tab. The average time to diagnosis for hEDS is over a decade: MCAS is frequently dismissed or misdiagnosed, and POTS is often attributed to anxiety. Every year of that odyssey — every appointment where someone was told it was in their head, every test that came back “normal,” every moment of self-doubt induced by a system that did not have the tools to see what was happening — is a withdrawal from a finite account. The tab does not close at diagnosis. It accumulates. And morphs into a new weird thing.

21. Anticipatory anxiety is a real energy expenditure. Planning for an event — a trip, a social gathering, a medical procedure — requires pre-loading energy management decisions days in advance. The Zebra Club community documents this: showering the day before an appointment to conserve energy the day of; scheduling rest days before and after anything significant; limiting social engagements to one per day. This pre-planning is not neurotic, it is rational resource management. But it is also cognitive and emotional work that runs in the background constantly, and it costs.

22. The energy cost of not being believed. This one does not have a clinical name. But it is real and it is documented in the patient community. Explaining your condition, defending your limitations, managing other people’s disbelief or impatience, performing wellness to avoid judgment — all of this is work. It is work that healthy people do not have to do. It runs in parallel with everything else, and it never fully stops.

VII. The Environmental Tax: What It Costs When the World Itself Is a Variable

23. Barometric pressure is a physiological variable, not a superstition. Drops in barometric pressure are documented triggers for migraines, joint pain, and symptom flares in EDS, POTS, and MCAS. The mechanism involves changes in tissue pressure, fluid dynamics, and potentially mast cell reactivity. The community has known this for years and the research is catching up. A storm system moving in is not a metaphor- I can feel it in my bones- is a variable.

24. Seasonal transitions are transition costs. Fall and spring — periods of rapid barometric and temperature fluctuation — are consistently reported as high-flare seasons in the EDS/POTS/MCAS community. The body is not adapting to one new state and it is constantly recalibrating to a moving target. Each recalibration costs.

25. Fragrance and chemical exposure are not preferences. For MCAS bodies, synthetic fragrance, cleaning products, new car smell, fresh paint, perfume in an elevator: are mast cell triggers. Avoiding them requires constant environmental vigilance and encountering them unexpectedly is an activation event with a recovery cost. This is not a preference or a sensitivity in the colloquial sense- it is an immune response.

26. Sleep architecture is broken at the structural level. MCAS mast cells have their own circadian rhythm and are most active at night. Histamine rising in the early morning hours causes early waking insomnia — documented in both MCAS literature and community experience. In hEDS, pain from repositioning, joint subluxations during sleep, and alpha-wave intrusion into deep sleep stages mean that sleep is frequently non-restorative even when hours are adequate. The person wakes having “slept” and is not rested. This is a structural problem with a different solution set than other types of insomnia.

VIII. The Compounding Variable: The One That Makes All the Others Worse

27. The threshold drops as the day progresses — and as the load accumulates. This is the piece that outsiders most consistently fail to understand. It is not that any one of these variables is catastrophic in isolation- It is that they stack. The metabolic cost of the morning commute, plus the mast cell activation from the fragrance in the office, plus the postprandial tachycardia after lunch, plus the cognitive load of a difficult meeting, plus the barometric pressure drop in the afternoon, plus the social cost of explaining why you need to sit down… by 3pm, the person who “seemed fine this morning” is not fine. They were never fine. They were managing a running total that nobody else could see, and the total finally exceeded the threshold.

The threshold itself is not fixed. It is lower when the baseline is already elevated — after a flare, during perimenopause, during a high-histamine season, after a bad night of sleep, after a medical appointment that went poorly. The same set of inputs that was manageable last Tuesday is not manageable today. And recover takes longer than just sleeping it off or catching up over the weekend. These bodies need radical rest and recovery to prevent further de-conditioning.

A Note on What This List Is For

I didn’t want to publish this as a complaint… I’m trying to validate and to demonstrate that there is a population of people who do not and cannot function with an overflowing bucket. We know our bodies and we know what bothers us before it registers intellectually. We need validation that this happens and that this happens to more people than we think. It might look slightly different in the next patient, but it’s all under this umbrella of connective tissue dysfunction.

This is also for the person who has been told, or feels that they are “too sensitive” and needs to understand that sensitivity is a physiological state with a documented cost. It is for the practitioner who needs to understand why their patient is exhausted before they even begin the appointment. It is for the partner or parent or colleague who cannot understand why someone who “seemed fine” yesterday cannot do the same thing today.

It is also for the person sitting on the couch in new pain, wondering if they should pay attention to it.

Pay attention to it.

Sources and voices drawn from:

Jeannie Di Bon (hEDS movement therapist, The Zebra Club); The Ehlers-Danlos Society fatigue and dysautonomia resources; Ladell et al. 2025 (metabolic cost of walking in hEDS/HSD, Frontiers in Rehabilitation Sciences); Sheehan et al. 2025 (muscle and tendon energy cost in HSD/hEDS); IFM 2025 (mast cells and stress, mind-body connection); Dr. Jessica Eccles (hypermobility and neurodivergence research); Weinstock et al. 2023 (neuropsychiatric manifestations of MCAS, PMC); Lara Briden (histamine and perimenopause); Mast Cell Action (women’s health and MCAS); community voices from The Zebra Club, r/POTS, r/MCAS, and the broader CTD patient community.