EDS type 3, now officially called hypermobile Ehlers-Danlos syndrome (hEDS), is a connective tissue disorder characterized by joints that move far beyond the normal range, chronic widespread pain, and a variety of systemic symptoms affecting the skin, digestive system, and nervous system. It is the most common form of Ehlers-Danlos syndrome, accounting for 80 to 90 percent of all EDS cases. Unlike most other EDS subtypes, hEDS has no identified genetic marker, so diagnosis relies entirely on clinical evaluation.
Why It’s Called “Type 3”
The older classification system numbered the different forms of EDS, and the hypermobile type was designated type 3 (sometimes written type III). In 2017, an international consortium revised the classification and replaced the numbering system with descriptive names. What was once type 3 became “hypermobile EDS” or hEDS, with stricter diagnostic criteria than had existed before. Many people still search for and use the old numbering, and doctors familiar with the condition will recognize either term.
What hEDS Feels Like
The defining feature is joint hypermobility, meaning your joints bend further than they should. But the experience goes well beyond being “flexible.” Research consistently finds that 100 percent of hEDS patients report musculoskeletal pain affecting more than one joint. The shoulders, knees, hips, and spine tend to be the worst, likely because these large, weight-bearing joints endure the most stress and have the greatest range of motion to begin with.
Many people with hEDS deal with frequent subluxations (partial dislocations) or full dislocations during everyday activities like reaching for something overhead or rolling over in bed. The skin is often unusually soft and may stretch more than normal, though not to the dramatic degree seen in other EDS types. Bruising easily, slow wound healing, and thin or widened scars are common. Fatigue is a major feature that often surprises people who expect the condition to be purely about joints.
Conditions That Often Overlap
hEDS rarely travels alone. Up to 40 percent of people with the condition have some form of autonomic dysfunction, most commonly postural orthostatic tachycardia syndrome (POTS), where your heart rate spikes abnormally when you stand up, causing dizziness, lightheadedness, or fainting. Gastrointestinal problems are even more common: up to 98 percent of hEDS patients meet criteria for a functional gastrointestinal disorder, with symptoms like nausea, bloating, constipation, acid reflux, and delayed stomach emptying (gastroparesis).
Mast cell activation issues, anxiety, and chronic headaches are also frequently reported. These overlapping conditions can sometimes be more disabling than the joint problems themselves, and recognizing the pattern can help both patients and clinicians connect symptoms that might otherwise seem unrelated.
How hEDS Is Diagnosed
Because there is no genetic test for hEDS, diagnosis follows a structured set of clinical criteria with three main requirements that all must be met.
Criterion 1: Generalized Joint Hypermobility
This is measured using the Beighton score, a 9-point scale based on five physical maneuvers. A clinician checks whether your pinky fingers bend backward past 90 degrees, whether your thumbs touch your forearms when the wrist is flexed, whether your elbows and knees hyperextend beyond 10 degrees, and whether you can place your palms flat on the floor with straight knees. Each side of the body scores separately (except for the spine test), giving a maximum of 9 points. Adults 50 and under need a score of 5 or higher; those over 50 need a 4 or higher.
Criterion 2: Additional Features
You need at least two of three features. Feature A is a checklist of systemic signs of a broader connective tissue problem (five or more must be present), which can include unusually soft or stretchy skin, stretch marks unrelated to significant weight change, and other markers. Feature B is a positive family history, with at least one first-degree relative who independently meets the hEDS criteria. Feature C involves musculoskeletal complications like chronic pain, joint instability, or recurrent dislocations that are best explained by hypermobility rather than another condition like rheumatoid arthritis.
Criterion 3: Ruling Out Other Conditions
The third requirement is exclusion of other diagnoses. There should be no signs of the more severe connective tissue features (significant skin fragility, vascular problems, or skeletal abnormalities) that would point to a different EDS subtype. Other conditions that cause joint looseness, like certain neuromuscular disorders, must also be considered and excluded.
hEDS vs. Hypermobility Spectrum Disorder
When the 2017 criteria were introduced, the diagnostic bar for hEDS was set higher than before. Experts recognized that many people who would have qualified under the older system would no longer meet the stricter criteria. To address this, a parallel category called hypermobility spectrum disorder (HSD) was created. If you have symptomatic hypermobility that causes real problems but you don’t check every box for hEDS, the diagnosis is HSD. Importantly, this is not a “lesser” diagnosis. People with HSD can be just as affected and benefit from the same management strategies. Neither condition has a genetic test; both are diagnosed clinically.
The Genetics So Far
Every other major EDS subtype has been linked to a specific gene mutation, typically in genes that produce or process collagen. hEDS is the exception. Despite being the most common subtype, its molecular basis has remained elusive for decades. Recent large-scale genetic studies have found the first evidence that common genetic variants contribute to hEDS risk, supporting a complex model involving multiple genes rather than a single mutation. This likely explains why the condition runs in families (it clearly does) without following a simple inheritance pattern. A definitive genetic test remains unavailable.
Treatment and Physical Therapy
There is no cure for hEDS, but the right management plan can significantly reduce pain, improve function, and prevent joint injuries. Physical therapy is the cornerstone of treatment, and the approach is different from standard rehab. The focus is on building muscular strength around unstable joints, improving proprioception (your body’s sense of where it is in space), and training postural stability.
Research supports several specific strategies. Progressive strengthening exercises, particularly closed kinetic chain movements (where your hands or feet stay planted, like squats or wall push-ups), have been shown to improve leg strength over eight-week programs. Heavy shoulder strengthening targeting the rotator cuff and scapular muscles, including isometric holds, improved both shoulder stability and reduced fear of movement after 16 weeks in one study. Spinal stabilization exercises performed three times a week for eight weeks improved trunk muscle endurance and balance. Programs combining strengthening with proprioception and balance training have been shown to reduce pain intensity within four weeks.
Aquatic exercise is popular in the hEDS community because water supports your joints while allowing you to build strength. Multidisciplinary programs that combine physical therapy with cognitive behavioral therapy have shown benefits for both strength and pain management. The key principle across all of these approaches is starting slowly, progressing gradually, and avoiding the push-crash cycle where you overdo it on good days and pay for it afterward.
Pregnancy Considerations
Pregnancy presents specific challenges for people with hEDS. Hormonal changes that loosen ligaments in all pregnancies can amplify joint instability, leading to more frequent dislocations and increased pain. POTS symptoms often worsen. During labor, some women experience unusually fast deliveries with a higher risk of perineal tearing due to tissue fragility. Postpartum hemorrhage is a recognized risk because of increased capillary fragility. Wound healing after cesarean delivery or perineal repair tends to be slower, and about 15 percent of women experience pelvic organ prolapse in the postpartum period.
A multidisciplinary care team that includes obstetrics, anesthesia, physiotherapy, and cardiology is recommended. Most women with hEDS have successful pregnancies, but planning ahead with providers who understand the condition makes a meaningful difference in outcomes.