Yes, burnout is a mental illness with multiple symptoms. It is a state of mental fatigue and emotional exhaustion, accompanied by physical symptoms like tiredness, chest pain, palpitations, breathlessness, and sleeplessness. It depletes the sufferer's energy and willpower, leaving them unable and unwilling to work. The hallmark of burnout is a profound loss of interest in work, which often spills over to the non-work areas of life.