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Table 2 Frequency of adverse effect

From: The effect of high-definition transcranial direct current stimulation intensity on motor performance in healthy adults: a randomized controlled trial

Symptom HD-tDCS 2 mA (n = 19) HD-tDCS 1.5 mA (n = 20) HD-tDCS sham (n = 19)
Tingling 17 (90%) 12 (60%) 15 (79%)
Burning sensation 6 (32%) 9 (45%) 8 (42%)
Itching 4 (21%) 9 (45%) 6 (32%)
Hair pulling 1 (5%)   1 (5%)
Irritating   1 (5%) 1 (5%)
  1. HD-tDCS 2 mA/1.5 mA high-definition transcranial direct current stimulation with an intensity of 2 mA/1.5 mA