Epilepsy is a symptomatic condition signaling an underlying neurological disorder, in which temporary changes in brain function trigger periodic seizures. Almost 50 percent of cases are diagnosed before the patient has reached the age of five, and the underlying cause of the condition is unknown in approximately 60 percent of cases. In cases where a cause can be identified, leading causes include brain trauma, stroke, brain injury, meningitis and alcohol poisoning. Pregnant women who are injured or suffer a serious illness during pregnancy may have epileptic children. Epileptic seizures, which can strike suddenly without warning or be triggered by stressors, can be effectively controlled with anticonvulsant medications.