Apraxia is a disorder of the brain and nervous system in which a person is unable to perform tasks or movements when asked, even though:

• The request or command is understood
• They are willing to perform the task
• The muscles needed to perform the task work properly
• The task may have already been learned

Apraxia is caused by damage to the brain. When apraxia develops in a person who was previously able to perform the tasks or abilities, it is called acquired apraxia.

The most common causes of acquired apraxia are:

• Brain tumor
• Condition that causes gradual worsening of the brain and nervous system (neurodegenerative illness)
• Dementia
• Stroke
• Traumatic brain injury

Apraxia may also be seen at birth. Symptoms appear as the child grows and develops. The cause is unknown.

Apraxia of speech is often present along with another speech disorder called aphasia. Depending on the cause of apraxia, a number of other brain or nervous system problems may be present.