MedlinePlus Medical Encyclopedia: Focal neurological deficits

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Focal neurological deficits

Contents of this page:
Illustrations Alternative names Definition Considerations	Common Causes Home Care Call your health care provider if What to expect at your health care provider's office

Illustrations

Brain

Alternative names Return to top

Neurological deficits - focal

Definition Return to top

A focal neurologic deficit is a problem in nerve function that affects either:

a specific location -- such as the left face, right face, left arm, right arm, left leg, right leg, even just a small area such as just the tongue
a specific function (for example, speech may be affected, but not the ability to write)

The problem occurs in the brain or nervous system. It may result in a loss of movement or sensation. The type, location, and severity of the change can indicate the area of the brain or nervous system that is affected.

In contrast, a non-focal problem is NOT specific -- such as a general loss of consciousness.

Considerations Return to top

Focal neurologic changes can include any function. Sensation changes include paresthesia (abnormal sensations), numbness, or decreases in sensation. Movement changes include paralysis, weakness, loss of muscle control, increased muscle tone, and loss of muscle tone.

Other types of focal loss of functions include:

Speech or language difficulties such as aphasia or dysarthria (impaired speech and language skills), poor enunciation, poor understanding of speech, impaired writing, impaired ability to read or to understand writing, inability to name objects (anomia)
Vision changes such as reduced vision, decreased visual field, sudden vision loss, double vision (diplopia)
Neglect or inattention to the surroundings on one side of the body
Loss of coordination, or loss of fine motor control (ability to perform complex movements)
Horner's syndrome: one-sided eyelid drooping, lack of sweating on one side of the face, and sinking of one eye into the socket
Poor gag reflex, swallowing difficulty, and frequent choking

Common Causes Return to top

Stroke
Brain tumor
Cerebral palsy
Disorders of a single nerve or nerve group (for example, see carpal tunnel syndrome)
Infection
Trauma
Neurodegenerative illness
Vascular malformation

Home Care Return to top

Home care depends on the type and the cause of neurologic loss. (See the specific causative disorder.)

Call your health care provider if Return to top

If any loss of movement, sensation, or function occurs, you should call your health care provider.

What to expect at your health care provider's office Return to top

The medical history will be obtained and a physical examination performed.

Medical history questions documenting neurological deficits in detail may include:

Location
- Where is the loss of function?
  - Right arm?
  - Right leg?
  - Left arm?
  - Left leg?
  - Another location (be specific)?
Quality
- What deficits are present?
  - Loss of vision?
  - Numbness?
  - Loss of movement?
  - Loss of strength?
  - Loss of hearing?
  - Speech problem or language problem?
  - Other (be specific)?
Other
- What other symptoms are also present?

The physical examination will include a detailed examination of nervous system function.

Diagnostic tests vary depending on other symptoms and the suspected cause of the nerve function loss.

After seeing your health care provider:
You may want to add a diagnosis related to focal neurological deficits to your personal medical record.

Update Date: 5/8/2003

Updated by: Elaine T. Kiriakopoulos, M.D., M.Sc., Department of Neurology, Beth Israel Deaconess Medical Center, Harvard University, Boston, MA. Review provided by VeriMed Healthcare Network.

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