Muscle convulsion: what to know

A muscle convulsion may be a seizure causing sudden stiffening, jerking, altered awareness, or loss of consciousness. Stay with the person, protect them from injury, and observe what happens rather than trying to restrain the movements.

A seizure results from abnormal electrical activity in the brain. It can affect the whole body or only one area, and awareness may be preserved or reduced. Low blood sugar, including Hypoglycaemia, can trigger a seizure. Meningitis may cause seizure with fever, severe headache, stiff neck, light sensitivity, or confusion. Alcohol withdrawal or Alcohol Use Disorder can also be relevant. A faint, movement disorder, or another event can look similar, so a first episode needs medical assessment.

Move nearby hard or sharp objects away, cushion the head, loosen tight clothing around the neck, and remove glasses. Do not put anything in the mouth, give food or drink, or hold the person down. When the jerking stops, place them on their side and check breathing. Note the start and end time, movements, awareness, injuries, and recovery; this information helps clinicians.

Call emergency services if the convulsion is prolonged, repeats without recovery, causes breathing difficulty or serious injury, occurs in water, happens during pregnancy, or is a first known seizure. Fever with stiff neck, confusion, or a severe headache is an emergency. Do not drive the person yourself if they are not fully recovered.

Ask what may have triggered the event, whether blood tests or brain and heart checks are needed, how to reduce recurrence risk, and when driving, swimming, or operating machinery can be resumed safely.