Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Seizures ?
    ### Response:
    Seizures are symptoms of a brain problem. They happen because of sudden, abnormal electrical activity in the brain. When people think of seizures, they often think of convulsions in which a person's body shakes rapidly and uncontrollably. Not all seizures cause convulsions.
    