Background: Electroencephalogram (EEG) is a mean of investigation of cortical and subcortical brain functional activity. Certain benign patterns may be epileptiform, yet can occur in healthy individuals without clinical epilepsy. Objective: Study of normal adult EEG and patterns of uncertain clinical significance. Subjects and Method: The present study was conducted on 100 adult Egyptian subjects (64 males and 36 females). All were subjected to history taking, examination and EEG evaluation. Results: Fifteen percent of participants have benign variants in their recorded EEG including Mu Rhythm (4%), OIRDA (5%), and FIRDA (6%). OIRDA and Mu Rhythm were more predominant in females, unlike FIRDA which was more predominant in males. The prevalence of artifacts in recorded EEG was 97% among participants. Among participants, there was epileptic activity recorded in 11 % of them. The prevalence of benign variants in EEG in participants was 15 %. Conclusion: Recording EEG pattern in normal adults help in minimizing over-interpretation and over-treatment of patients.