Jackknife seizures, also known as tonic-clonic seizures or grand mal seizures, are a type of epileptic seizure characterized by the sudden onset of generalized muscle convulsions. These seizures can cause loss of consciousness, stiffness, jerking movements, and foaming at the mouth. Although "jackknife seizures" is a commonly used term, there are also several synonyms to describe this type of seizure. Some alternative terms include tonic-clonic seizures, major motor seizures, generalized convulsive seizures, or full-body seizures. It is important to be familiar with these synonyms, as they assist in enhancing communication between healthcare providers and individuals affected by epilepsy, ensuring accurate understanding and appropriate medical care.