Free Guide to Understanding Ehlers-Danlos Syndrome

What Is Ehlers-Danlos Syndrome and How Does It Affect the Body

Ehlers-Danlos Syndrome (EDS) is a group of genetic disorders that affect connective tissues throughout the body. Connective tissues are the fibers that hold your body together, providing structure and support to skin, bones, ligaments, tendons, and blood vessels. When someone has EDS, their body produces collagen differently than typical, or the collagen doesn't work the way it should. This affects how strong and flexible these tissues are.

There are 13 recognized types of EDS, with some more common than others. The most frequently seen type is hypermobility EDS (hEDS), which accounts for about 90% of diagnoses. Other notable types include classical EDS, vascular EDS, and kyphoscoliotic EDS. Each type has different characteristics and affects the body in different ways.

People with EDS often experience a range of physical symptoms. The most recognizable feature is hypermobility—joints that move beyond their normal range of motion. This can make someone appear unusually flexible, but it often comes with pain and instability. Beyond joint issues, EDS can affect the skin (which may be stretchy, velvety, or fragile), cause chronic pain, lead to digestive problems, affect the heart and blood vessels, and create issues with healing after injuries or surgery.

The severity of EDS varies dramatically from person to person, even among people with the same type. Some individuals have mild symptoms that barely interfere with daily life, while others face significant challenges with mobility, pain management, and organ function. This variability makes EDS difficult to understand at first glance, which is why education about the condition matters.

Practical takeaway: Learning the basic facts about EDS—that it's a connective tissue disorder affecting multiple body systems—helps you understand why people with this condition may need different approaches to physical activity, medical care, and daily management.

The Genetics Behind Ehlers-Danlos Syndrome

EDS is an inherited condition, meaning it runs in families through genetic mutations. Most types of EDS follow an autosomal dominant inheritance pattern. In simple terms, this means a person needs to inherit the mutated gene from just one parent to develop the condition. If a parent has EDS, each of their children has roughly a 50% chance of inheriting the mutation.

Some rarer types of EDS follow an autosomal recessive pattern, which means a person must inherit the mutated gene from both parents to develop the condition. Parents who each carry one copy of the recessive gene typically don't show symptoms themselves, but their children might be affected if they inherit the mutation from both parents.

The genetic mutations in EDS primarily affect how the body produces or processes collagen. Collagen is the most abundant protein in the human body, making up about one-third of all protein. It provides tensile strength to tissues, similar to how steel reinforces concrete. When collagen genes are mutated, the collagen produced may be structurally weak, produced in insufficient quantities, or improperly assembled. Over time, this leads to the various symptoms associated with different EDS types.

Modern genetic testing can identify mutations associated with many EDS types, though not all. Testing typically involves a blood sample that gets analyzed in a laboratory. However, genetic testing results can be complex to interpret, and some people receive negative genetic tests despite having clear clinical symptoms of EDS. This is why diagnosis often combines genetic testing, family history, clinical examination, and skin biopsy findings.

Genetic counseling can help families understand their inheritance risks and what to expect. A genetic counselor can explain test results, discuss the likelihood that other family members might be affected, and provide information about reproductive options for families where EDS is present.

Practical takeaway: Understanding that EDS is genetic helps explain why multiple family members might be affected and why genetic counseling and testing may be valuable parts of the diagnostic process.

Recognizing Symptoms and Signs of Ehlers-Danlos Syndrome

EDS presents through a wide variety of symptoms, and the specific combination differs among individuals and between the different types. Joint hypermobility is perhaps the most characteristic feature, but it's far from the only sign. Many people with EDS describe a lifelong pattern of unusual flexibility, dislocating joints, sprains that seem to happen too easily, and chronic joint pain.

Skin symptoms in EDS can include unusual texture (velvety or silky feeling), stretchiness, fragility that leads to easy bruising or poor wound healing, or visible scars that look atypical. Some individuals develop skin that appears translucent or shows visible veins. In classical EDS, the skin changes are often quite obvious, while in other types they may be subtle.

Beyond joints and skin, people with EDS frequently report:

• Chronic widespread pain, often described as fibromyalgia-like
• Gastrointestinal issues including reflux, constipation, and difficulty swallowing
• Cardiovascular complications such as mitral valve prolapse or blood vessel fragility
• Dental problems including tooth loss, gum disease, and issues with tooth enamel
• Vision problems including myopia, astigmatism, or corneal fragility
• Fatigue and reduced exercise tolerance
• Headaches and migraines
• Autonomic nervous system dysfunction (affecting heart rate, blood pressure, and temperature regulation)

It's important to note that EDS symptoms often develop or worsen over time. A child might seem merely flexible, while the same person at age 30 experiences significant pain and joint instability. Pregnancy, physical activity, and overall health status can all influence how noticeable symptoms become.

Many people with EDS report that they were initially misdiagnosed or told their symptoms were psychological rather than physical. This happens because EDS can be unfamiliar to some healthcare providers, and the wide range of symptoms sometimes leads to multiple specialist consultations before reaching a diagnosis.

Practical takeaway: Recognizing the broad range of potential EDS symptoms—beyond just flexibility—helps both patients and families understand why multiple body systems might be affected and why comprehensive medical evaluation matters.

Getting a Diagnosis: What to Expect

Diagnosing EDS typically involves several steps and may require consultation with specialists who understand connective tissue disorders. The process often begins with a detailed medical history and physical examination. Your healthcare provider will ask about your symptoms, family history of EDS or connective tissue disorders, and how symptoms have progressed over time. During the physical exam, they'll assess joint range of motion, skin appearance, and other physical signs.

The Beighton score is a commonly used screening tool for hypermobility. This simple test assesses whether you can perform nine specific movements that demonstrate unusual flexibility, such as touching your palms to the floor with straight legs or bending your thumbs backward. A score of 5 or higher (out of 9) suggests hypermobility, though the test has limitations and doesn't diagnose EDS by itself.

Genetic testing is an important diagnostic tool for many EDS types. A blood sample is sent to a laboratory where technicians analyze your DNA for known mutations associated with EDS. Results typically take several weeks. It's worth noting that genetic testing has limitations—not all EDS cases have identifiable genetic mutations, and a negative test doesn't rule out the condition.

A skin biopsy may be performed, particularly for classical or dermatosparaxis EDS. During this procedure, a small sample of skin is removed and examined under a microscope or sent for electron microscopy and biochemical analysis. This can reveal abnormalities in collagen structure or composition that support an EDS diagnosis.

Finding a healthcare provider experienced with EDS can significantly improve the diagnostic process. The Ehlers-Danlos Society maintains lists of specialists and centers that focus on connective tissue disorders. Some major academic medical centers have dedicated EDS clinics. If your local healthcare providers are unfamiliar with EDS, seeking a second opinion from a specialist familiar with the condition may be worthwhile.

The diagnostic journey can take time—some people receive their EDS diagnosis quickly, while others take years of appointments and testing before getting answers. Keeping detailed records of your symptoms