This is a sudden, brief loss of consciousness with loss of postural tone followed by spontaneous revival. The patient is motionless and usually has cool extremities, a weak pulse, and shallow breathing. Sometimes brief involuntary muscle jerks occur, resembling a seizure.

This is described as a feeling of overall weakness, a feeling of discomfort, feeling like you have an illness, simply not feeling well. It often occurs with fatigue and an inability to restore a feeling of health through proper rest. Sometimes, it happens suddenly. Other times, it may develop gradually and persist for a long period. The reason behind it can be extremely difficult to determine because it can be the result of many conditions.