Joint hypermobility, a condition where joints extend beyond the typical range of motion, affects an estimated 10% to 30% of the population. While some individuals experience minimal impact, for others, hypermobility can extend beyond joint laxity to conditions like hypermobility spectrum disorders (HSDs) and hypermobile Ehlers-Danlos Syndrome (hEDS), impacting various bodily systems.
Experts identify several common symptoms associated with joint hypermobility.
Unstable and Painful Joints
Recurrent sprains, strains, and joints that feel unstable or prone to giving out are hallmarks of hypermobility. This instability arises because the connective tissue does not adequately stabilize the joint, forcing surrounding muscles to compensate and leading to fatigue. Some individuals experience joints that click, crackle, or partially dislocate, a phenomenon known as subluxation, where the bones in a joint slip out of their proper alignment. These partial dislocations, most common in the shoulder but also occurring in the knee, finger, jaw, and ankle, can cause transient pain and swelling.
Joint pain is frequently reported, often stemming from the strain on muscles and nerves that support the unstable joints. This pain can become chronic, even when standard medical imaging appears normal. Physicians explain that the pain often originates from the supporting structures outside the joint, such as muscles and fascia, which are not always visible on conventional scans.
Systemic Symptoms
Beyond the musculoskeletal system, hypermobility can be linked to other conditions. Anxiety, including generalized anxiety, panic attacks, and social anxiety, is significantly more prevalent in individuals with hypermobility. Researchers suggest this may be related to differences in autonomic nervous system regulation and interoception, the body's ability to sense internal signals. When the body experiences symptoms like rapid heart rate, dizziness, or shortness of breath, the brain may interpret these as threats, contributing to anxiety.
Fatigue is another common symptom, ranging from requiring extended recovery time after exertion to profound exhaustion that impedes daily life. This can be exacerbated by sleep disorders, such as sleep apnea and insomnia, which are also more common in people with hypermobility. Autonomic dysfunction can lead to exhaustion even after minor activities. Furthermore, the increased muscular effort needed to stabilize hypermobile joints can consume more energy during routine tasks.
Skin and Cardiovascular Manifestations
Individuals with hypermobility may exhibit distinct skin characteristics, including skin that is soft, stretchy, fragile, or bruises easily. Atrophic scarring, which appears sunken or thin, is also noted. These skin traits can sometimes be related to underlying issues with collagen or its regulating proteins.
Dysautonomia, a dysfunction of the autonomic nervous system that regulates involuntary bodily processes, is another associated condition. Symptoms can include dizziness, lightheadedness, a racing heart, palpitations, brain fog, exercise intolerance, and digestive issues. A common form, postural orthostatic tachycardia syndrome (POTS), often seen in hypermobile individuals, causes a rapid heart rate and can lead to symptoms like shortness of breath and brain fog, particularly upon standing. This occurs because the veins in the legs may not constrict properly, causing blood to pool and the heart to beat faster to compensate, potentially leading to insufficient blood flow to the brain.
While many symptoms can be challenging, hypermobility itself is not always disadvantageous. The flexibility can be beneficial in certain physical activities and professions, such as dance, yoga, and Pilates, especially when individuals focus on strengthening the muscles that support their joints.