Central Post-Stroke Pain

Most pain after a stroke is not this. Shoulders stiffen, muscles spasm, joints ache from altered movement. Central post-stroke pain is different and rarer: pain produced by the stroke’s damage to the brain’s own pain pathways, felt on the side of the body the stroke affected, in the same territory where sensation changed. It affects roughly 1 in 10 stroke survivors, often begins months after the stroke, and is frequently missed because nobody, including the patient, is expecting the stroke to produce something new.

Pain from inside the pathway

Pain and temperature signals travel from the body up a dedicated tract in the spinal cord to the thalamus, the brain’s relay station, and on to the cortex. A stroke that damages any part of that line can leave a pain system that fires without input, or that misreads ordinary input as pain. The condition was first described in 1906 by Dejerine and Roussy as “thalamic syndrome,” and the thalamus remains the classic site: a 2012 lesion-mapping study found that strokes touching a specific border zone within it carried a particularly high risk. But strokes in the brainstem, and elsewhere along the tract, produce the same picture.

What it feels like is distinctive. A constant burning, aching, or pricking, sometimes with lancing jolts, in the affected arm, leg, face, or an entire half of the body. Sensation in the same area is altered, commonly with a striking sensitivity to cold. And in most people, touch or temperature that should be harmless is painful: allodynia, the hallmark of nerve-generated pain. A 1995 Danish study that followed stroke patients for a year found the condition in 8%, nearly all of whom had this evoked pain to touch or cold.

The delay

A 2020 meta-analysis pooled the available studies and found central pain in about 11% of stroke survivors overall, rising above 50% in those whose strokes had caused sensory loss or hit the thalamus. Only a third of cases began in the first month. Most started between one month and a year, and some later still. By then, follow-up visits are spaced out, rehabilitation has often ended, and a new burning pain is easy to attribute to a shoulder, a hip, or “just part of the stroke.” The clue is the map: central pain follows the territory of sensory change, not a joint or a muscle.

Why it hurts

The best-supported explanation is disinhibition. The pain pathway is normally kept in check by parallel systems, including the descending controls described in how pain works. A stroke that removes part of that balance leaves surviving circuits firing unopposed, and the thalamus and cortex begin to generate the sensation of pain on their own. Cold sensitivity, the particular signature of this condition, fits the idea that the stroke has knocked out one lane of the temperature system and left its partner shouting. This is why the pain does not respond to treatments aimed at the arm or the leg. The problem is upstream.

What treatment looks like today

Honest framing first: central post-stroke pain is among the harder pains to treat, and the trials are small. What they show, described rather than prescribed:

• Tricyclic antidepressants. Amitriptyline was the first drug shown to help, in a small 1989 trial, and remains a first-line option in the major guidelines for central neuropathic pain, with the usual cautions about side effects in older adults and after stroke.
• Lamotrigine. A 2001 randomized trial found a modest but real reduction in daily pain, with 44% of patients responding. Slow titration is required for safety, which the prescriber will explain.
• Gabapentinoids. The largest trial in the condition, pregabalin in 2011, did not beat placebo on its main pain measure, though sleep, anxiety, and overall status improved. Guidelines still list the class because of its record in other central pain, an honest example of extrapolated evidence.
• Serotonin-norepinephrine reuptake inhibitors. Duloxetine and related drugs are guideline first-line options for neuropathic pain generally and are commonly used here, with less direct trial evidence.
• Brain stimulation, for refractory cases. Repetitive transcranial magnetic stimulation of the motor cortex has reasonable evidence for short-term relief in central pain, and implanted motor cortex stimulation is used in specialist centers when everything else has failed. Both are covered in neuromodulation.

Opioids have a poor record in central pain and are not recommended as ongoing treatment. If you or someone you love is struggling with opioid or other substance use, the SAMHSA National Helpline is free, confidential, and open 24/7 at 1-800-662-HELP (4357).

Alongside medication, the same principles that help every persistent pain apply: protecting sleep, staying as active as the stroke allows, and understanding the mechanism, because a burning arm that you know is the brain misfiring is easier to live with than one you fear is a second stroke arriving.

What’s coming

Lesion mapping is turning into prediction: studies now identify which stroke locations carry the highest risk, which opens the door to watching for the condition before it appears rather than years after. Non-invasive brain stimulation is being refined for exactly this indication, and the pipeline of new neuropathic pain drugs, aimed at sodium channels and other targets, is being tested in central pain as well as peripheral.

When to seek specialist care

Any new or worsening symptom after a stroke deserves a call to the stroke team, because the first job is always to rule out a new event. Once that is done, a new burning, aching, or cold-sensitive pain on the affected side that follows the area of sensory change should be named as possible central post-stroke pain and treated as such. A neurologist, a physiatrist (rehabilitation physician), or a pain medicine physician with neuropathic pain experience is the right specialist. Bring the map: where the pain is, where sensation changed, and when it started relative to the stroke. Those three facts make the diagnosis.