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A stroke happens when the blood supply is blocked or interrupted to an area of the brain. This can be caused by a blood clot or haemorrhage (bleed) which in turn damages a part of the brain. Sometimes when the brain attempts to repair itself after this injury it may inadvertently generate abnormal nerve connections that can lead to seizures and epilepsy.
Sometimes seizures can occur during or after a stroke. As a general rule, seizures that happen during or shortly after a stroke have a low chance developing into epilepsy. But if a seizure first occurs weeks or months after the stroke there is a much greater likelihood of developing epilepsy. Some doctors will prescribe a temporary antiseizure medication as a preventative measure after a stroke even if no seizure has occurred. This decision is usually made based on whether a seizure has already happened, the type of stroke, the location of the stroke and information from other tests such as the electroencephalogram (EEG)