Altered Mental Status
A change in awareness, thinking, or alertness
Quick Facts
- Type: Neurological / general medical sign
- Ranges from: Mild confusion to unresponsiveness
- Common causes: Infection, low blood sugar, medicines, stroke
- Action: Often a medical emergency
Overview
Altered mental status is a broad term for any change in a person's normal level of awareness, thinking, or alertness. It can appear as confusion, disorientation, difficulty paying attention, unusual behavior, excessive sleepiness, agitation, or, in severe cases, unresponsiveness. The change may come on suddenly over minutes to hours or develop more gradually over days.
Altered mental status is not a disease itself but a sign that something is affecting the brain. The cause may be in the brain directly, such as a stroke or seizure, or come from elsewhere in the body, such as an infection, low blood sugar, or a medication effect. Because some causes are life-threatening, a new or worsening change in mental status usually needs prompt medical evaluation, and many cases are treated as emergencies.
Symptoms
Altered mental status can show up in many ways, and the person may not recognize the change in themselves. Signs that others may notice include:
- Confusion or not knowing the time, place, or familiar people
- Trouble paying attention or following a conversation
- Unusual drowsiness or being hard to wake
- Agitation, restlessness, or unusual behavior
- Slurred or rambling speech
- Memory problems that are new
- Reduced response to voice or touch, up to unresponsiveness
A person who cannot be fully awakened, is deeply confused, or has these changes along with weakness, trouble speaking, or a severe headache needs emergency care immediately.
Causes
Many conditions can change mental status. Common categories include:
- Infections: Urinary tract infections, pneumonia, sepsis, or brain infections, especially in older adults.
- Metabolic problems: Low or high blood sugar, low sodium or other electrolyte disorders, kidney or liver failure, and low oxygen.
- Medicines and substances: Sedatives, opioids, alcohol intoxication or withdrawal, and drug interactions or overdose.
- Brain conditions: Stroke, seizures, head injury, bleeding around or within the brain, and brain tumors.
- Other: Dehydration, very high or low body temperature, and hormone disorders.
Risk Factors
- Older age, especially with memory problems
- Dementia or prior stroke
- Taking multiple medications, especially sedatives or opioids
- Diabetes, kidney disease, or liver disease
- Recent surgery, infection, or hospitalization
- Alcohol or substance use
Diagnosis
Finding the cause is urgent and involves a focused evaluation:
- History and examination: What changed and how fast, current medicines, and a neurological exam, often using a quick alertness scale.
- Bedside tests: Blood sugar and oxygen levels are checked early because low blood sugar and low oxygen are quickly treatable.
- Blood and urine tests: To look for infection, electrolyte or organ problems, and toxins.
- Brain imaging: CT or MRI to check for stroke, bleeding, or injury.
- Other tests: An EEG for suspected seizures or a lumbar puncture if a brain infection is suspected.
Treatment
Treatment is directed at the underlying cause while keeping the person safe and stable.
- Immediate stabilization: Ensuring breathing, oxygen, and circulation are adequate, and treating reversible causes such as low blood sugar right away.
- Treating the cause: Antibiotics for infection, correcting electrolytes or fluids, reversing certain drug effects, or urgent stroke and seizure care.
- Stopping or adjusting medicines: When a drug is responsible.
- Supportive care: Monitoring, preventing falls and injury, and treating agitation gently when needed.
Many people recover fully once the cause is corrected, especially when treatment is started early. Recovery may take longer in older adults or when the cause is serious.
Prevention
- Manage chronic conditions such as diabetes, kidney disease, and heart disease
- Review all medications with a doctor or pharmacist, especially in older adults
- Treat infections early and stay hydrated during illness
- Avoid excess alcohol and never mix sedatives or opioids without medical advice
- For people with dementia, keep familiar routines and watch for sudden changes
- Seek prompt care for head injuries
When to See a Doctor
Any new confusion or change in alertness should be evaluated promptly. Call emergency services or go to an emergency department immediately if a person:
- Cannot be fully awakened or is unresponsive
- Has sudden confusion with weakness, numbness, trouble speaking, or a drooping face (possible stroke)
- Has a seizure, severe headache, or head injury
- Shows confusion with high fever, fast breathing, or signs of serious infection
- Has very low or high blood sugar in known diabetes
Frequently Asked Questions
What does altered mental status mean?
It means a change from a person's normal awareness, thinking, or alertness. This can range from mild confusion and disorientation to severe drowsiness or being unresponsive, and it signals that something is affecting the brain.
Is altered mental status an emergency?
It often is. Call emergency services for sudden confusion with weakness or trouble speaking, a seizure, a head injury, unresponsiveness, or confusion with high fever. Even gradual changes should be evaluated promptly because several causes are serious but treatable.
What commonly causes confusion in older adults?
Infections such as urinary tract infections and pneumonia, dehydration, medication effects, low blood sugar, and electrolyte problems are frequent causes. Stroke and worsening dementia can also be responsible, so evaluation is important.
Can altered mental status be reversed?
Yes, many cases improve fully once the cause is treated, such as correcting low blood sugar, treating an infection, or stopping a responsible medicine. Recovery depends on the cause and how quickly it is addressed.
How do doctors find the cause?
They review what changed and the person's medicines, perform a neurological exam, and check blood sugar and oxygen first. Blood and urine tests, brain imaging such as CT or MRI, and sometimes an EEG or spinal fluid test help identify the cause.
References
- MedlinePlus, U.S. National Library of Medicine. Confusion.
- Mayo Clinic. Confusion and altered mental status.
- National Institute on Aging. Delirium and sudden confusion.
- Centers for Disease Control and Prevention (CDC). Sepsis.