No, an EEG is not painful.
An EEG (Electroencephalogram) is a test that measures the electrical activity in your brain. It uses small, metal discs called electrodes that are attached to your scalp with a special paste. The electrodes pick up the electrical signals from your brain and send them to a machine that records them.
The electrodes are painless, and the paste is usually not uncomfortable. Some people may feel a slight tingling sensation when the electrodes are first attached, but this usually goes away quickly.
The entire procedure is usually quick and easy, and most people find it painless.
