Percussion myotonia

A localized myotonic contraction in a muscle in reaction to percussion (tapping with the examiner's finger, a rubber percussion hammer, or a similar object).

What is Percussion myotonia?

Percussion myotonia is a symptom that people may experience for many reasons. It can be related to infections, chronic conditions, injuries, medication effects, or other health changes. The presence of this symptom alone does not diagnose any condition.

If you have Percussion myotonia that is severe, persistent, or accompanied by other warning signs, contact a qualified healthcare provider.

Possible conditions associated with Percussion myotonia

The following conditions have been associated with Percussion myotonia. Only a health professional can determine the underlying cause.

mitochondrial complex IV deficiency, nuclear type 23

Any mitochondrial complex IV deficiency in which the cause of the disease is a mutation in the COX11 gene.

Related symptoms

Abdominal distentionClonic seizureFocal-onset seizureGastroesophageal refluxHypoventilationSensorineural hearing impairment

When to seek medical care

Seek urgent care if Percussion myotonia is severe, sudden, or occurs with chest pain, difficulty breathing, confusion, severe weakness, or other serious symptoms.