Epilepsy and memory loss can be connected in several ways. Some seizures, especially grand mal seizures, can cause temporary memory loss. Uncontrolled seizures over a period of time can also affect memory functions. Sometimes seizures and memory loss have the same cause, such as a head injury.

Epilepsy causes seizures, episodes where the brain fires random electrical signals. These seizures can affect only part of the brain or the entire brain. Epilepsy is treated with anti-convulsant medications, and in some cases, surgery. If epilepsy is not treated, the seizures may become more frequent and more severe, and lead to more pronounced memory loss.

Generalized tonic-clonic seizures, also called grand mal seizures, affect the entire brain. In this type of seizure, a person will lose consciousness and thrash their limbs about. After a grand mal seizure, the person affected will often forget events surrounding the seizure.

Petit mal seizures are another way that epilepsy and memory loss are related. Unlike grand mal seizures, petit mal seizures are characterized by an absence of movement, consciousness, and focus. During a petit mal seizure, a person will stop what she is doing and stare off into space, unresponsive. These seizures typically only last a few seconds, but a person will not remember the seizure episode, and sometimes may forget the events surrounding it as well.

Studies show that chronic epilepsy and memory loss often go hand in hand. A study done by the University of Wisconsin showed that rats that suffered from continuous grand mal seizures began to demonstrate abnormalities in the hippocampus, a part of the brain involved in long term memory and spatial memory. These rats began to suffer memory loss, showing deficits in spatial memory and neuronal loss.

Temporal lobe epilepsy and memory loss can also be connected. A study from the Annals of Neurology followed people with temporal lobe epilepsy who were treated either medically or with surgery. This study found that chronic temporal lobe epilepsy and memory loss were correlated. People who were treated and had their seizures under control, however, were able to return to normal in terms of memory functioning.

Seizures and memory loss can sometimes have the same cause. Head trauma can cause both seizures and memory loss, depending on the severity of the trauma and the area affected. Dementia can also complicate the relationship between epilepsy and memory loss. Dementia describes disorders that cause a gradual loss of cognitive functions, including memory. Some types of dementia can also cause seizures.