Burnout, or the burnout syndrome, is an exhaustion of physical or emotional strength or motivation usually as a result of prolonged stress or frustration. It occurs when you feel overwhelmed and unable to meet constant demands. As the stress continues, you begin to lose the interest or motivation that led you to take on a certain role in the first place.
Everybody can be affected by the burnout syndrom. It is not a matter of age, gender or profession. It's really strange that the most competent, efficient and commited people have the biggest risk of being affected by a burnout.