Randomization
CRF, pain
CRF
Centralized randomization will be performed on D0 after verification of the inclusion criteria. Randomization will be performed under double-blind conditions and will be stratified according to the mean baseline pain intensity (4–6 or 7) over the last 48 hours before inclusion and according to centre.Patients will be randomized to receive either active tDCS or sham tDCS for the 5 treatment days defined by the protocol. The randomization ratio will be 1:1. Randomization will be stratified by centre by means of the Ennov Clinical electronic CRF (Randomization lists will be established by a Nantes university hospital research promotion department statistician.A patient registered in the trial, to whom treatment has been allocated and documented, will be considered to be randomized. A patient cannot be included, evaluated or randomized in the trial more than once.