Symptoms of overtraining syndrome include persistent fatigue, decreased performance, increased susceptibility to injuries, hormonal imbalances, and mood disturbances such as irritability or depression. Individuals may also experience disrupted sleep patterns, decreased appetite, and a weakened immune response. Overtraining often occurs when there is an imbalance between training intensity and recovery. Recognizing these symptoms is crucial so that athletes can adapt their training plans and allow for adequate rest and recovery to prevent further complications.