This is a neurological disorder characterized by the occurrence of convulsions or seizures and a loss of consciousness or momentary loss of awareness. Usually, the symptoms appear suddenly and occasionally. The person has a warning that an attack is about to occur. The warning can be in the form of unpleasant sensations of sound, sight or smell, a change of mood, or pain or trembling in the muscles. There are a number of different causes, including brain injury, tumour or inflammation, disorders of metabolism such as hypo glycemia, brain haemorrhage, and birth trauma.