Because generalized seizures involve abnormal brain activity throughout the whole brain, symptoms associated with these types of seizures are wide-ranging and may appear to be very severe. Unlike partial seizures, which may only involve one part of the body or one aspect of behavior, the symptoms of generalized seizures usually involve the entire body and often result in a loss of consciousness.

Some common symptoms related to generalized seizures include:

• Jerking or twitching muscles
  
• Sudden stiffening of muscles
  
• Disruption of involuntary bodily functions, such as breathing or bladder control
  
• Loss of muscle control throughout the entire body
  
• Loss of consciousness
  
• Salivation or foaming from the mouth
• Jaw clenching or tongue biting

Many people with recurring generalized seizures experience a combination of certain symptoms in addition to some symptoms of partial seizures (e.g., hallucinations).  

Generalized seizures are often followed by symptoms of fatigue, drowsiness and confusion. Sleepiness may last for an hour or more, and a person may feel weak for up to two days following a generalized seizure. A person who has experienced a generalized seizure may have no memory of the event. In addition, some people may become agitated immediately following the seizure.

Immediate medical attention should be sought if a person has a seizure but no history of previous seizures, or if any of the following symptoms occur:

• Physical injury is sustained during the seizure
  
• Seizure lasts 5 minutes or longer
  
• Failure to regain normal state of mind within an hour after a seizure