Changes in behaviour
A change in how a person acts is called altered behaviour. A change may include:
- Confusion.
- Disorientation to time and place.
- Unusually aggressive or combative behaviour.
- Lethargy, unexplained sleepiness, or the inability to arouse a person from sleep.
Altered behaviour can be caused by conditions or substances that may affect the brain, such as:
- Prescription and non-prescription medicine.
- Drug and alcohol abuse or withdrawal.
- Electrolyte imbalances.
- Exposure to toxins, such as carbon monoxide, arsenic, or lead.
- Lack of oxygen to the brain.
- Head injury.
- Seizure.
- Abnormally high blood sugar (ketoacidosis) or abnormally low blood sugar (hypoglycemia).
- Infection, especially in older adults.
- Mental health problems, such as anxiety disorders, depression, or psychosis.
- Blockages in the blood vessels in the brain, such as in a stroke.
- Bleeding in the brain from a head injury or stroke.
- Destruction of brain tissue by a tumour.
- Pressure on brain tissue by a tumour or swelling.
Changes in behaviour may be sudden, such as those caused by a stroke or head injury, or gradual, such as those caused by a tumour or swelling in the brain.
| Author: | Jan Nissl, RN, BS | Last Updated: February 7, 2008 |
| Medical Review: | William M. Green, MD - Emergency Medicine H. Michael O'Connor, MD - Emergency Medicine | |
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