Pain is one of the body's most important protective systems. In an acute injury, pain encourages us to protect an injured area while tissues recover. However, when pain persists for months or years, the relationship between pain and tissue damage becomes much more complex.
Pain is not simply a signal travelling from an injured muscle, joint or nerve to the brain. Nociception — the detection of potentially threatening mechanical, chemical or thermal stimuli — and the actual experience of pain are different processes.
The nervous system interprets incoming information together with many other factors that influence the pain experience. This means that the intensity of pain does not always reflect the amount of tissue damage present. Someone may have significant structural changes on imaging with relatively little pain, while another person may experience significant and persistent pain even after the original tissue injury has recovered.
In persistent pain, the systems responsible for processing pain can become more sensitive and protective. Signals that would normally be considered safe may begin to produce pain, while painful stimuli may feel stronger or last longer than expected.
This does not mean that the pain is psychological or imagined. The pain is real, but the mechanisms contributing to it may have changed. Understanding these mechanisms allows persistent pain to be approached as more than simply a problem with a painful body part.
Persistent pain is not always driven by the same mechanism. Understanding what type of pain is present and what may be maintaining it is an important part of deciding how it should be managed.
Nociceptive pain originates when tissues such as muscles, joints, tendons, connective tissue or internal structures generate signals associated with actual or potential tissue threat. This may occur with injury, mechanical irritation, inflammation, hypoxia or excessive tissue loading. It is generally more closely related to the affected area and may change predictably with movement, position or load.
Neuropathic pain occurs when there is injury or disease affecting the somatosensory nervous system. It can produce symptoms such as burning, shooting or electric pain, tingling, numbness, altered sensation or increased sensitivity. Radicular pain associated with an affected spinal nerve is a common example.
Nociplastic pain or central sensitisation involves changes in how the nervous system processes and regulates sensory information. The system becomes more sensitive, allowing pain to be triggered more easily or amplified. Pain may become more widespread, less predictable, disproportionate to the original injury or persist beyond expected tissue-healing times.
These mechanisms are not necessarily separate. A person can have nociceptive, neuropathic and nociplastic components at the same time, and their relative importance can change as a condition progresses.
This is why persistent pain cannot always be understood by looking only at the painful structure. Identifying the dominant pain mechanisms provides a more complete understanding of what may be happening and how recovery can be approached.
Pain is a personal experience that is influenced by much more than what is happening in the painful tissue. The nervous system continuously combines information from the body with information about the person and their environment, which can increase or decrease the pain experience.
Physical factors such as the type of injury, inflammation, tissue loading, movement and previous injuries can influence the signals reaching the nervous system.
At the same time, sleep, fatigue, stress and the body's general physiological state can influence how sensitive the nervous system is to those signals. This is one reason pain may feel different from one day to another even when the underlying condition has not significantly changed.
Previous experiences, emotions, expectations and beliefs can also influence pain. Fear, uncertainty or concern about what a symptom means may increase the perceived threat associated with a sensation, while understanding the problem and feeling confident about movement can influence it in the opposite direction.
The social environment also matters. Work demands, relationships, family circumstances, social support and significant life events can influence stress, behaviour and the way a person experiences and responds to pain.
Therefore, the pain someone experiences at any given moment reflects the interaction between tissue-related signals, nervous-system sensitivity, physical and physiological state, previous experiences, thoughts and emotions, and the social environment.
There is rarely a single reason why pain persists. In many cases, several factors interact over time and can contribute to a nervous system that becomes more sensitive, protective and responsive to potential threats.
Prolonged or repeated pain can repeatedly activate pain-processing pathways. Over time, this may increase their sensitivity, meaning that pain becomes easier to trigger and may continue even when the original tissue problem has improved.
Poor sleep can affect pain regulation and is associated with increased pain sensitivity. Pain can then disrupt sleep further, creating a cycle in which poor sleep increases sensitivity and increased pain makes restorative sleep more difficult.
Prolonged stress can maintain activation of the body's stress-response systems and influence autonomic, hormonal and immune activity. When this state continues, the nervous system may become more reactive to incoming signals, while pain itself can become an additional source of stress.
Fear and reduced movement can create a self-reinforcing cycle. Pain may make someone afraid that movement will cause further damage, so they begin to move less. With time, reduced activity can lead to stiffness, weakness, poorer physical capacity and changes in circulation and tissue metabolism. Reduced oxygen availability and the accumulation of local metabolites can contribute to nociceptive and inflammatory signalling, potentially making the area more sensitive. If movement then becomes painful or difficult, this can reinforce the original fear and lead to even greater avoidance.
Previous pain experiences and beliefs about the body can influence how new sensations are interpreted. Previous injuries, difficult recovery experiences or uncertainty about what pain means may increase vigilance towards bodily sensations, particularly when someone believes that pain always represents ongoing damage.
Immune and inflammatory processes may also influence pain sensitivity in some conditions. Communication between the immune and nervous systems can modify how sensory information is processed, particularly during prolonged inflammation or illness.
Finally, social and environmental circumstances can influence recovery. Work stress, reduced social support, isolation, financial concerns or difficult life circumstances can increase the overall stress burden while reducing opportunities for sleep, movement, recovery and healthy behaviours.
Persistent pain management may be appropriate if you experience:
My approach combines Osteopathy, Physiotherapy and Psychoneuroimmunology to understand not only where you hurt, but why the pain may be persisting.
The first step is identifying the pain mechanisms most likely contributing to your symptoms and the factors that may be influencing them. This may include tissue and joint function, nerve involvement, nervous-system sensitivity, movement and physical capacity, previous injuries, sleep, stress and lifestyle.
An important part of treatment is helping you understand your pain and what it means for your body. Persistent pain does not always mean persistent damage, and developing a better understanding of the problem can help reduce unnecessary fear and rebuild confidence in movement.
Treatment is personalised and may combine manual therapy, progressive exercise and rehabilitation, pain education, movement strategies, stress and sleep management, and lifestyle interventions according to your individual presentation.
Rather than relying only on short-term symptom relief, rehabilitation aims to progressively restore movement, strength and physical capacity, reduce sensitivity where possible, and help you return confidently to the activities that are important to you.
My approach is designed to work alongside appropriate medical care and other treatments you may be receiving, rather than replacing them.
The overall goal is to move beyond repeatedly treating the painful area and develop a more complete strategy addressing the mechanisms and contributing factors that may be maintaining pain and limiting recovery.
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