Fatigue is one of the earliest symptoms of overtraining. Some experts call the earliest symptoms, those that resolve quickly if you just decrease the workout intensity on every third or fourth day, overreaching rather than overtraining.
If you continue overreaching without recovery, you may experience some of these symptoms of overtraining:
Tension Irritability Decreased appetite Restless sleep Loss of sexual desire More aches and pains Declining athletic performance In the more severe form of the overtraining syndrome, the following can occur:
Depression Menstrual irregularities in women More significant sleep problems Prolonged muscle soreness Markedly diminished athletic performance