Overtraining in athletes can occur when there is an imbalance between training stress and recovery, leading to a continuous decrease in performance over time despite increased training. Common symptoms of overtraining syndrome (OTS) include chronic fatigue, irritability, loss of appetite and focus. OTS results from inadequate recovery from repeated bouts of intense training. To prevent and treat OTS, athletes should emphasize recovery, vary their training, and avoid overworking one area for a prolonged period through proper periodization of their training plan.