Substance use and withdrawalĪ first-time seizure in adulthood may be related to the use of certain substances or withdrawal from them. It may also cause seizures by disrupting the way your brain releases neurotransmitters. contusion, which is a bruise of the brainĭepending on the injury, a TBI can trigger seizures by causing inflammation or damaging brain tissue.Other factors that increase your risk of seizures after a TBI include: More severe injuries are more likely to cause seizures. About 50 percent of TBI-related seizures happen within the first 24 hours. In other cases, they might happen within hours, days, or weeks after the injury. Traumatic brain injuryĪnother possible cause of a first-time seizure is a traumatic brain injury (TBI).Īfter a TBI, the seizures may occur immediately. If the seizures recur or get worse, it might mean that the tumor has grown, or caused bleeding or swelling.īrain tumors that can trigger seizures include:ĭifferent types of tumors cause seizures in different ways, usually due to pressure or bleeding in the brain. This can prompt an immune or inflammatory response that leads to abnormal changes in your brain’s electrical activity.Įxamples of CNS infections that can lead to seizures include:Īdult-onset seizures are often the first sign of a brain tumor. These pathogens cause infection in brain tissue. Severe central nervous system (CNS) infections caused by bacteria, parasites, or viruses can trigger seizures. Possible causes of adult-onset seizures include: Central nervous system infection This is different than seizures that appear in childhood, which are usually due to idiopathic epilepsy, or related to an unknown cause. Adult-onset seizures are typically due to a specific condition or traumatic event.
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