tDCS for Chronic Pain

tDCS uses two electrodes on the scalp with a very weak direct current flowing between them. Unlike magnetic stimulation, this current does not trigger nerve cell firing but gently shifts the readiness of nerve cells to fire, depending on polarity it can slightly raise or dampen the excitability of a region. Over repeated sessions the processing in pain-relevant networks can change. For how tDCS differs from magnetic stimulation, read rTMS vs. tDCS.

Chronic pain is more than a signal from injured tissue. Over time the brain "learns" the pain, pain-processing regions such as the sensorimotor cortex become oversensitive, and several brain networks fall out of balance. tDCS targets exactly this by modulating the excitability of these regions in a targeted way. Frequently the motor cortex (M1) or the prefrontal cortex is stimulated. More on the condition at Chronic pain.

A tDCS session is straightforward and low in discomfort: two moistened electrodes are positioned at defined sites, then a weak current flows for around 20 minutes. At the start you often feel a light tingling or itching, which usually subsides. tDCS is considered well tolerated; side effects are mild (e.g. skin redness, slight tingling). A course comprises several sessions. Before starting, a physician in our program reviews your diagnostics and defines the target region and protocol.

For chronic pain, tDCS is usually used off-label. This is no contradiction to careful medicine: off-label means using a procedure outside its formal approval when it is medically justified and sensible in the individual case. We do not treat "the pain" in a blanket way but the network profile measured in you, which is why the assessment, not the device, comes first. What off-label means exactly is explained at Off-label treatment explained.

tDCS for chronic pain is intensively researched; meta-analyses show moderate effects for individual pain conditions, while the results overall are heterogeneous. We rate the evidence as moderate and use tDCS as one building block, often combined with further methods and ongoing assessments. Real, linked studies are available at Science & Studies. How well you respond shows over the sessions; we measure the course and adjust the program to it.