IRCT20190311043012N2 IRCT 2019-06-27 Semnan University of Medical Sciences The effect of brain current stimulation on fear of pain in chronic low back pain The effect of stimulation on fear of pain in people with chronic low back pain with high fear 2019-05-10 anticipated 50 Complete https://irct.ir/trial/38882 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Simple randomization of random numbers that arranged as non-ordinating numbers in a table and read in the lower order.The names of people with the specified code are arranged in the table and these numbers are read from top to bottom of the table. The first 25 people in the intervention group and rest of them located in the sham group, Blinding description: The tDCS will be used on the control group participants from the beginning of the treatment session, but the duration of the current is only 30 seconds, and after disconnection of the electrical current, the electrodes remain on the respective brain regions for 20 minutes. N/A low back pain. Intervention 1: Intervention group: trans cranial direct current stimulation with mA and 20 minutes on dorsolateral prefrontal in Consecutive 5 days. Intervention 2: Control group: Trans cranial direct current stimulation of the brain to trade off for 20 minutes ( The current there was only in the first 30 seconds). No - There is not a plan to make this available Justification or reason for not sharing IPD is No more information