Show YAML
name: com_Hypermobile_Ehlers-Danlos_Syndrome__Postural_Orthostatic_Tachycardia_Syndrome
creation_date: '2026-09-18T02:22:57Z'
curation_status: CANDIDATE
notes: >-
Widely recognized clinical comorbidity between hypermobile Ehlers-Danlos
syndrome (hEDS) and postural orthostatic tachycardia syndrome (POTS):
postural tachycardia syndrome is described as the most commonly recognized
circulatory disorder among patients with joint hypermobility or
Ehlers-Danlos syndrome, and a 2025 AGA Clinical Practice Update explicitly
flags the association for clinicians while noting that the underlying
biological mechanism remains unconfirmed. A cross-sectional cohort of
clinically diagnosed EDS/HSD patients found POTS in a majority of
participants (60.9%-78.6%, depending on subgroup). This contrasts with a
community-based pediatric study that found no significant excess of POTS
among children with joint hyperlaxity screened by Beighton score alone
(not clinically diagnosed hEDS), suggesting the strength of the association
may depend on how the connective-tissue phenotype is ascertained.
Directionality is UNKNOWN -- both conditions can present in either temporal
order and are often diagnosed together during the same clinical workup. No
ICEES KG signal exists for this pair (searched; see association_signals).
disease_a:
slug: Hypermobile_Ehlers-Danlos_Syndrome
preferred_term: Ehlers-Danlos syndrome, hypermobility type
term:
id: MONDO:0007523
label: Ehlers-Danlos syndrome, hypermobility type
disease_b:
slug: Postural_Orthostatic_Tachycardia_Syndrome
preferred_term: postural orthostatic tachycardia syndrome
term:
id: MONDO:0011479
label: postural orthostatic tachycardia syndrome
directionality: UNKNOWN
hypotheses:
- description: >-
Hypothesis: the generalized connective-tissue laxity of hEDS extends to
the vasculature, producing excessive venous compliance and pooling in
the lower body on standing; the resulting fall in venous return and
cardiac preload triggers a compensatory sympathetic/tachycardic response
that manifests as POTS. This is the commonly cited framing for the
association, but professional-society guidance explicitly states that
the experimental evidence for the underlying biological mechanism is
still limited, so the mechanistic step from connective-tissue laxity to
autonomic dysfunction is not yet established -- only the clinical
association itself is well documented.
evidence:
- reference: PMID:40387691
reference_title: "AGA Clinical Practice Update on GI Manifestations and Autonomic or Immune Dysfunction in Hypermobile Ehlers-Danlos Syndrome: Expert Review."
supports: SUPPORT
quote_role: REVIEW_SYNTHESIS
evidence_source: HUMAN_CLINICAL
snippet: "Clinicians should be aware of the observed associations between hEDS or HSDs and POTS and/or MCAS and their overlapping gastrointestinal (GI) manifestations; while theoretical explanations exist, experimental evidence of the biological mechanisms that explain relationships is limited and evolving."
explanation: >-
An American Gastroenterological Association expert consensus statement
establishes the hEDS-POTS association as clinically recognized while
explicitly cautioning that the biological mechanism is unconfirmed --
the honest epistemic status of the mechanistic hypothesis above.
- reference: PMID:29519641
reference_title: "Postural tachycardia syndrome and other forms of orthostatic intolerance in Ehlers-Danlos syndrome."
supports: SUPPORT
quote_role: REVIEW_SYNTHESIS
evidence_source: HUMAN_CLINICAL
snippet: "There is a strong association between several forms of cardiovascular dysfunction, most notably postural tachycardia syndrome, and joint hypermobility or Ehlers-Danlos syndrome."
explanation: >-
A literature review of 10 studies concludes that postural tachycardia
syndrome is the most commonly recognized circulatory disorder
associated with joint hypermobility and Ehlers-Danlos syndrome.
pathophysiology:
- name: Vascular connective tissue laxity and orthostatic venous pooling
description: >-
Proposed (not yet experimentally confirmed) mechanism: laxity of the
collagenous support structures of the venous wall reduces venous tone,
increasing venous compliance and dependent pooling on standing, which
lowers cardiac preload and provokes a compensatory tachycardic
response.
biological_processes:
- preferred_term: reduced venous tone
term:
id: GO:0042310
label: vasoconstriction
modifier: DECREASED
association_signals:
- source: LITERATURE
method: LITERATURE_ASSOCIATION
signal_disorder_a_id: MONDO:0007523
signal_disorder_b_id: MONDO:0011479
population: >-
Cross-sectional cohort of 37 participants diagnosed with hypermobility
spectrum disorder (HSD) or Ehlers-Danlos syndrome (EDS) per the 2017
Diagnostic Consensus Criteria, split into 23 with spondyloarthritis
(SpA) + EDS and 14 with EDS-only.
directionality: UNKNOWN
statistics:
metrics:
- metric_type: PREVALENCE
metric_value: 60.9
notes: POTS prevalence in the SpA + EDS subgroup (n=23).
- metric_type: PREVALENCE
metric_value: 78.6
notes: POTS prevalence in the EDS-only subgroup (n=14).
evidence:
- reference: PMID:42229474
reference_title: "Comorbidities in Ehlers-Danlos syndromes and hypermobile spectrum disorders."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "POTS (60.9% vs 78.6%) and IBS (60.9% vs 85.7%) occurred at similar frequencies in both groups."
explanation: >-
Directly quantifies POTS prevalence in a clinically diagnosed
EDS/HSD cohort, showing a majority of patients affected in both
subgroups.
- source: LITERATURE
method: LITERATURE_ASSOCIATION
signal_disorder_a_id: MONDO:0007523
signal_disorder_b_id: MONDO:0011479
population: >-
Community-based sample of 306 schoolchildren (ages 10-18) from public
schools in three Colombian cities, screened for joint hyperlaxity by
Beighton score (not clinically diagnosed hEDS) and for POTS by
orthostatic vital-sign testing.
mapping_notes: >-
This is a general-population screening study, not a clinically diagnosed
hEDS cohort -- joint hyperlaxity by Beighton score alone is a broader,
less specific phenotype than hEDS. Recorded as REFUTE because the
study's own result is a non-significant, near-zero co-occurrence rate;
graded directness: INDIRECT because generalizing that result to the
hEDS-specific claim above requires crossing a difference in
ascertainment (broad hyperlaxity screening versus clinically diagnosed
hEDS), not because the finding itself is equivocal.
directionality: UNKNOWN
statistics:
metrics:
- metric_type: PREVALENCE
metric_value: 1.2
p_value: 0.5188
notes: >-
Co-occurrence of joint hyperlaxity and POTS in the same child (1 of
87 hyperlax children, 1.2%), not statistically significant.
evidence:
- reference: PMID:35506776
reference_title: "Prevalence of joint hypermobility, postural orthostatic tachycardia syndrome (POTS), and orthostatic hypotension in school-children."
supports: REFUTE
directness: INDIRECT
evidence_source: HUMAN_CLINICAL
snippet: "Of 87 children with joint hyperlaxi ty, only 1 child had joint hyperlaxity at the same time as postural hypotension (1.2%) (p = 0.6735), and 1 child had joint hyperlaxity and postural orthostatic tachycardia syndrome simultaneously (1.2%) (p = 0.5188)."
explanation: >-
Community-level screening study found no statistically significant
excess co-occurrence of joint hyperlaxity and POTS, in tension with
the much higher prevalence seen in clinically diagnosed EDS/HSD
cohorts.
- source: ICEES
method: EHR_COHORT_ASSOCIATION
signal_disorder_a_id: MONDO:0007523
signal_disorder_b_id: MONDO:0011479
population: ICEES KG snapshot 8-20-2024 (RENCI/UNC).
mapping_notes: >-
Searched: rebuilt the local ICEES KG snapshot with `just icees-refresh`
and queried it with `just icees-rebuild --id MONDO:0007523,MONDO:0011479`.
The snapshot contains only 226 nodes total (a small set of UNC-Health
cohort-specific concepts, e.g. asthma, PCD), and neither
MONDO:0007523 (hEDS) nor MONDO:0011479 (POTS) appears among them --
confirmed by grepping the decompressed node list directly. No ICEES
signal exists for this pair in the current snapshot; this is recorded
here rather than silently omitted.
directionality: UNKNOWN