Is Being Double Jointed Linked To Adhd?

If you have ever watched a child twist their arm into a pretzel or bend a thumb flat against their wrist, you may have wondered what is going on underneath the skin. Being “double jointed” is the everyday term for what doctors call joint hypermobility — joints that move beyond the normal range. And there is a real, documented connection between hypermobility and ADHD. Research has repeatedly found that children and adults with ADHD are more likely to have hypermobile joints than people without ADHD, and the reverse also appears true. The link is not a coincidence, and it is not a diagnosis on its own. It points to something shared in how connective tissue and the nervous system develop.

What Does “Double Jointed” Actually Mean?

Nobody has two joints where there should be one. The phrase “double jointed” is a lay term, not a medical one. It describes joints that stretch further than usual because the connective tissue holding them together is more elastic.

That tissue is largely made of collagen and related proteins. Collagen gives ligaments, tendons, and skin their strength and their limits. When collagen is built a little differently, or is more stretchy, joints can bend past the typical stopping point. Doctors call this joint hypermobility.

Hypermobility exists on a spectrum. At one end, it is simply a harmless trait — many people are flexible and have no pain or problems. At the other end, it can be part of a heritable connective tissue condition where joints are unstable and cause pain, dislocations, or other symptoms. Most people who are hypermobile sit somewhere in the milder range.

A commonly used clinical tool called the Beighton score helps estimate how hypermobile someone is. It assigns points for things like bending a pinky back past 90 degrees, touching the thumb to the forearm, and hyperextending the knees or elbows. A higher score means more mobility, though the score alone does not diagnose a disorder.

Is Being Double Jointed Linked To ADHD?

Yes. Multiple studies have found a statistical association between joint hypermobility and ADHD. Children with ADHD tend to score higher on hypermobility measures than children without it, and some studies of hypermobile children find higher rates of attention problems.

This does not mean one causes the other. An association means the two conditions show up together more often than chance would predict. It does not tell us which comes first, or whether a third factor drives both.

The link has been reported across different age groups and in different countries, which makes it harder to dismiss as a fluke of one small sample. Still, the research has limits. Many studies are small. Some rely on parent reports rather than clinical exams. And the strength of the association varies from study to study. The connection is real but modest — it is a tendency, not a rule. Plenty of hypermobile people have no attention issues at all, and plenty of people with ADHD are not hypermobile.

Why Would Joints and Attention Be Connected?

The most widely discussed explanation involves collagen. Collagen is not only in joints. It is also a structural component of blood vessels, skin, and other tissues — and it appears in the connective tissue that supports the nervous system.

If collagen is built differently throughout the body, it could affect both the joints and the brain. One idea is that differences in connective tissue around blood vessels and nerves influence how the nervous system develops or functions. Another idea centers on proprioception — the body’s sense of where its limbs are in space.

Proprioception relies on signals from receptors in muscles, tendons, and joints. Hypermobile joints may send less reliable position signals. Some researchers propose that a brain working harder to track body position might have less capacity left for attention and focus. This is a plausible hypothesis, not a proven mechanism. No study has yet shown this is what actually happens in people with both conditions.

There is also the possibility that both traits share underlying genetic factors. Genes involved in connective tissue and genes involved in brain signaling could overlap, or the two conditions could run together in families for reasons we do not fully understand. The honest position is that the mechanism remains an area of active research.

What the Research Does and Does Not Show

The evidence supports a connection. It does not support a simple story.

• Studies consistently find that hypermobility is more common in people with ADHD than in the general population.
• The association appears in both children and adults.
• Most studies are observational, meaning they can show a link but cannot prove cause.
• Sample sizes are often small, and measurement methods differ between studies.
• No research shows that being hypermobile causes ADHD, or that ADHD causes hypermobility.

It is worth being careful about how this gets talked about online. Some sources suggest that hypermobility “explains” attention problems or that treating joint issues will resolve ADHD symptoms. No clinical evidence currently confirms that. The two conditions can coexist and each deserves its own evaluation and care.

Could Hypermobility Be Mistaken for ADHD Symptoms?

This is a fair question, and it is one researchers have raised. If a child is constantly shifting, fidgeting, or struggling to sit still, that could reflect attention difficulties — or it could reflect discomfort from unstable, achy joints. Pain and instability can make sitting still genuinely hard.

Fatigue is another overlap. Hypermobility is sometimes associated with tiredness, and fatigue can look like poor concentration. Poor sleep, which is common in both hypermobile people and people with ADHD, can also muddy the picture.

None of this means hypermobility is being mislabeled as ADHD in most cases. ADHD has clear diagnostic criteria that go well beyond restlessness. But when a hypermobile child is being evaluated for attention problems, it is reasonable for a clinician to consider whether physical discomfort is contributing to the symptoms.

What Should You Do With This Information?

If you or your child is hypermobile and also has attention or focus concerns, the useful step is to have both assessed properly rather than assuming one explains the other.

For the joints, that means a clinician who can check for pain, instability, injuries, or signs of a broader connective tissue condition. For attention, it means a proper evaluation against established ADHD criteria. These are separate conversations, and both can matter.

Some clinicians recommend strengthening muscles around unstable joints and working on balance and body awareness, since stronger muscles can help stabilize joints. This is common practice, though the evidence for how much it helps varies by situation. Physical therapy is often part of care for symptomatic hypermobility.

What is not supported is the idea that fixing joint issues will treat ADHD, or that ADHD treatment will resolve joint pain. There is no established treatment that addresses both at once, because the shared mechanism, if there is one, is not yet understood well enough to target.

Does This Change How Either Condition Is Managed?

Not in any proven way. The connection is interesting and worth knowing, but it has not yet led to different treatment recommendations for either condition.

ADHD is managed with approaches that have their own evidence base, including behavioral strategies and, when appropriate, medication. Hypermobility is managed based on symptoms — often nothing at all if there is no pain, and physical therapy or other support if there is. The overlap does not currently change either plan.

What the link does offer is a reason to look a little more closely. If a person has one of these conditions, it may be worth being aware of the other. A hypermobile child who struggles to focus might benefit from an ADHD evaluation. A person with ADHD who has chronic joint pain or frequent injuries might benefit from having their joints examined. That kind of attention is reasonable even without a full explanation of why the two travel together.

What Is the Bottom Line?

Being double jointed and having ADHD do appear to be linked. The connection shows up in study after study, and it is not explained away by chance. But it is a tendency, not a cause, and it does not mean every flexible person has attention problems or the reverse.

The most accurate way to hold this is as a clue rather than a conclusion. It suggests that connective tissue and the nervous system may share some biology, and it gives researchers a direction to explore. For anyone living with either condition, the practical takeaway is simple: if you notice signs of the other, get it checked. The link is real, but it is not a diagnosis, and it does not stand in for proper evaluation.