Neuropathic pain is defined by the International Association for the Study of Pain (IASP) as pain arising as a direct consequence of a lesion or disease affecting the somatosensory system.
Neuropathic pain is characterised by continuous or intermittent spontaneous pain, typically described as burning, aching or shooting in nature. The pain may be provoked by normally innocuous stimuli (allodynia). Neuropathic pain is also commonly associated with hyperalgesia (increased pain intensity evoked by normally painful stimuli), paraesthesia and dysaesthesia.
There are no accurate figures for the overall prevalence of neuropathic pain.
- The prevalence of neuropathic pain has been estimated to be between 6% and 8%.
- A large study of computerised records in primary care from the Netherlands estimated the annual incidence of neuropathic pain in the general population to be almost 1%.
- Painful diabetic neuropathy is estimated to affect between 16% and 26% of people with diabetes.
- Prevalence estimates for postherpetic neuralgia range from 8% to 19% of people with herpes zoster when defined as pain at one month after rash onset, and 8% when defined as pain at three months after rash onset.
- The development of chronic pain after surgery is also fairly common, with estimates of prevalence ranging from 10% to 50% after many common operations. This pain is severe in between 2% and 10% of these patients, and many of the clinical features closely resemble those of neuropathic pain.
Common causes of neuropathic pain include:
- Painful diabetic neuralgia.
- Postherpetic neuralgia.
- Trigeminal neuralgia.
- Lumbar radiculopathy.
- Nerve damage, including postoperative.
- Pain because of cancer tumour infiltration.
- Alcohol neuropathy.
- Post-stroke pain.
- Multiple sclerosis.
- Chemotherapy-induced pain.
- Neuropathic contributions to other painful conditions.
- The treatment of the underlying causative condition is central to the management of neuropathic pain but is outside the scope of this article. Neuropathy caused by mechanical pressure, for example, may require surgical and other interventional procedures.
- The main role of the GP in the management of neuropathic pain is in the control of symptoms where the underlying cause is medical, where the condition is of a chronic, recurring or acute self-limiting nature, or whilst awaiting specialist intervention.
- Prescribing of therapy with little evidence of efficacy in neuropathic pain is still common in the UK and consequently treatment is often not in line with current guidance.
- When selecting a particular medication, the National Institute for Health and Care Excellence (NICE) recommends considering comorbidities, safety considerations, contra-indications, patient preference, lifestyle factors, any history of mental health problems (eg, anxiety, depression) and existing medication history.
- Clear advice should be given about dosage instructions, preferably in writing.
- Consider overlapping old and new treatment to prevent deterioration in pain control.
- Review the patient early after starting or changing treatment.
- Review the patient regularly, covering such aspects as pain control, side-effects, effect on daily living (eg, driving, working), mood, sleep and overall improvement.
Consider referring the person to a specialist pain service and/or a condition-specific service at any stage, including at initial presentation and at the regular clinical reviews, if:
- They have severe pain; or
- Their pain significantly limits their lifestyle, daily activities (including sleep disturbance) and participation; or
- Their underlying health condition has deteriorated.
- Psychological techniques - cognitive behavioural therapy has shown some benefit in the treatment of chronic pain.
- Studies of chronic pain management suggest that a combination of psychological, pharmacological and physical therapies, tailored to the needs of the individual patient, may be the best approach.
- Percutaneous electrical nerve stimulation (PENS) has shown evidence of short-term benefit for refractory neuropathic pain.
- NICE recommends the use of spinal cord stimulation in patients who have had chronic pain for six months (measuring at least 50 mm on a 0-100 mm visual analogue scale) despite conventional medical management (providing a prior trial of stimulation has proved to be effective).
- There is no good evidence supporting the efficacy of other non-drug measures, such as acupuncture, homeopathy or transcutaneous electical nerve stimulation (TENS) for neuropathic pain.
All neuropathic pain (except trigeminal neuralgia):
- Offer a choice of amitriptyline, duloxetine, gabapentin or pregabalin as initial treatment for neuropathic pain (except trigeminal neuralgia).
- If the initial treatment is not effective or is not tolerated, offer one of the remaining three drugs, and consider switching again if the second and third drugs tried are also not effective or not tolerated.
- Consider short-term tramadol only if acute rescue therapy is needed.
- Consider capsaicin cream for people with localised neuropathic pain who wish to avoid, or who cannot tolerate, oral treatments.
- Combining two or more different drugs may improve analgesic efficacy and, in some situations, reduce overall side-effects. However, there is insufficient evidence to recommend any one specific drug combination for neuropathic pain.
Do not start the following to treat neuropathic pain in non-specialist settings, unless advised by a specialist to do so: cannabis sativa extract, capsaicin patch, lacosamide, lamotrigine, levetiracetam, morphine, oxcarbazepine, topiramate, long-term tramadol, venlafaxine.
- Offer carbamazepine as initial treatment for trigeminal neuralgia.
- Phenytoin may also be effective.
- If initial treatment with carbamazepine is not effective, is not tolerated or is contra-indicated, consider seeking expert advice from a specialist and consider early referral to a specialist pain service or a condition-specific service.
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- Management of chronic pain; Scottish Intercollegiate Guidelines Network - SIGN (Dec 2013)
- Guidelines on the pharmacological treatment of neuropathic pain; European Federation of Neurological Societies (2010)
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- Percutaneous electrical nerve stimulation for refractory neuropathic pain; NICE Interventional Procedure Guidance, March 2013
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- British National Formulary; NICE Evidence Services (UK access only)
- Chaparro LE, Wiffen PJ, Moore RA, et al; Combination pharmacotherapy for the treatment of neuropathic pain in adults. Cochrane Database Syst Rev. 2012 Jul 11 7:CD008943. doi: 10.1002/14651858.CD008943.pub2.
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