Can Hypermobility Cause Tight Muscles?

The Hypermobility Paradox

One of the most consistently misunderstood presentations in musculoskeletal clinical practice is the hypermobile patient who reports chronic muscle tightness. The intuitive assumption — that hypermobile individuals are flexible and therefore cannot be tight — is physiologically incorrect. In practice, generalised joint hypermobility (GJH) and hypermobility spectrum disorders (HSD) are associated with some of the highest rates of chronic muscular tension, myofascial trigger points, and perceived stiffness seen in any patient population. Understanding why requires an appreciation of the relationship between joint stability, connective tissue properties, and the nervous system's protective response.

Lax ligaments and hypercompliant joint capsules — the connective tissue changes that produce hypermobility — mean that joint stability cannot be passively provided by the articular structures themselves. The nervous system responds to this instability by chronically co-contracting the muscles surrounding the unstable joints as a protective mechanism. This is not a voluntary or conscious process; it is a subconscious motor control adaptation mediated through the gamma motor neuron system and muscle spindle sensitivity. The muscles are persistently active at low levels, never fully releasing, and over time they develop the shortening, fatigue, and trigger point formation that the patient experiences as tightness.

The Neuromuscular Mechanism

In a joint with normal passive stability, the ligaments, capsule, and labrum absorb much of the load of body weight and movement, with muscles contributing dynamic stabilisation as needed. In a hypermobile joint, the passive structures are excessively compliant and provide minimal restraint through the available range. The proprioceptors within these structures — the Ruffini endings, Pacinian corpuscles, and Golgi tendon organ-like receptors in the capsule and ligaments — provide less reliable joint position sense, which is itself an established finding in hypermobility. The nervous system responds by increasing muscle stiffness through tonic co-contraction — essentially using the muscles as the primary stability mechanism rather than the passive articular structures. This is metabolically expensive and mechanically inefficient.

The muscles most commonly presenting with tightness in hypermobile individuals are those with the most direct stabilising role at the most hypermobile joints: the cervical deep flexors (at the atlanto-axial and mid-cervical levels), the lumbar multifidus and quadratus lumborum (at the lumbar spine and SIJ), the hip short rotators and adductors (at the hip and SIJ), and the knee flexors and calf complex (at the knee and subtalar joint).

Clinical Assessment

The clinical presentation typically includes the Beighton score of ≥4/9 (a clinical screening tool for hypermobility assessing thumb hyperextension, fifth finger extension, elbow hyperextension, knee hyperextension, and forward flexion with palms flat on the floor), combined with a history of widespread musculoskeletal pain, easy bruising, poor wound healing, gastric motility issues, and orthostatic intolerance — all connective tissue-related features. The muscle tightness is typically persistent, poorly responsive to stretching, and associated with frequent minor joint sprains from activities of daily life. Formal diagnosis of hypermobility spectrum disorder or hypermobile Ehlers-Danlos syndrome (hEDS) requires clinical assessment against established diagnostic criteria.

What Actually Helps

Management of muscle tightness in hypermobility prioritises stability over flexibility. Therapeutic exercise targeting the deep stabilising muscles — particularly the deep cervical flexors, multifidus, transversus abdominis, and deep hip rotators — reduces the reliance on global superficial muscles for joint stabilisation and thereby reduces their chronic protective tone. Manual therapy targeting specific trigger points and myofascial restrictions provides symptomatic relief and restores movement quality, provided it is not performed in a way that further destabilises the joints. Proprioceptive training — balance work, coordination exercises, and movement patterning — addresses the neurological driver of the protective muscle contraction by improving joint position sense.