Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Epilepsy ?
    ### Response:
    Epilepsy is a brain disorder that causes people to have recurring seizures. The seizures happen when clusters of nerve cells, or neurons, in the brain send out the wrong signals. People may have strange sensations and emotions or behave strangely. They may have violent muscle spasms or lose consciousness.
    