Confusion and Delirium
Informed by recognized medical guidance
If symptoms are severe, worsening, or life-threatening, seek urgent medical care now.
Overview
Delirium is a sudden change in someone’s mental state that makes them confused, unable to focus, and disorganised in their thinking. It usually comes on over a few hours or days and is often caused by a treatable medical problem like an infection or a reaction to a medicine.
Key facts
- Delirium is a medical emergency – it needs immediate attention.
- It is different from dementia: delirium comes on suddenly, while dementia develops slowly over months or years.
- Most people recover fully if the underlying cause is found and treated early.
Yes, delirium is very common, especially in older adults who are in hospital or recovering from surgery. It affects about 1 in 5 older hospital patients.
Older adults, people with several health conditions, those who have just had surgery, and people with dementia or sensory problems (like poor eyesight or hearing) are most at risk. But it can happen to anyone of any age.
Symptoms
- Sudden confusion along with a high fever or shaking chills
- Confusion after a head injury
- Difficulty breathing or chest pain
- Severe headache or stiff neck
- Seizures (fitting)
- ⚠Confusion that comes on suddenly – even without the above symptoms – especially in an older person or someone with a chronic illness
- ⚠Trouble speaking, weakness on one side of the body, or vision changes
- ⚠Confusion that happens after starting a new medicine or changing a dose
Common symptoms
- Sudden confusion or disorientation – not knowing where they are or what time it is
- Trouble focusing or keeping attention
- Rambling or fast speech that doesn’t make sense
- Seeing or hearing things that are not there (hallucinations)
- Being very sleepy or very agitated and restless
- Mood changes – fear, anger, or sadness
Symptoms in children
- Irritability or fussiness that is not typical
- Not wanting to play or interact with others
- Trouble waking up or being too sleepy
- Seeming to be in a daze
Symptoms in older adults
- A sudden worsening of their usual confusion (if they already have dementia)
- Becoming very withdrawn, quiet, or sleeping too much
- Restlessness, pacing, or trying to get out of bed
- Changes in sleep – sleeping during the day and awake at night
Causes
Main causes
- Infections such as a urinary tract infection, pneumonia, or a wound infection
- Side effects of certain medicines or interactions between different medicines
- Dehydration or an imbalance in salts (electrolytes) in the body
- Alcohol or drug withdrawal
- Lack of oxygen (for example, from a lung problem or heart failure)
- Severe pain or a recent surgery (especially hip surgery or heart surgery)
Risk factors
- Being over 65 years old
- Having dementia or memory problems
- Having a serious illness such as heart disease, diabetes, or kidney failure
- Having had delirium before
- Poor eyesight or hearing that is not corrected
- Sleep problems or being in an unfamiliar environment (like a hospital)
When to see a doctor
See a doctor urgently if:
- Seek urgent medical help – call your local emergency number – if someone has sudden confusion along with any of the emergency symptoms listed above.
- If confusion starts suddenly in an older adult or after a surgery, contact your doctor or go to the nearest emergency department the same day.
Book a routine appointment if:
- If someone has gradual, mild confusion that has been going on for weeks or months – this may be a sign of dementia and should still be checked by a doctor, but it is not an emergency.
Diagnosis
A doctor will ask about the person’s medical history, recent infections, medicines, and any changes in behaviour. They will do a physical exam and check vital signs like temperature and blood pressure.
Tests that may be done
- Blood tests to look for infection, dehydration, or abnormal salt levels
- Urine test to check for a urinary tract infection
- Chest X-ray to look for pneumonia
- An electrocardiogram (ECG) to check the heart
- Sometimes a CT scan or MRI of the brain if a head injury or stroke is suspected
What to expect at your appointment
The doctor may ask the person questions to check their thinking and attention. The person may need to stay in hospital for a short time to find and treat the cause. Family members or carers are often asked to help describe what happened.
Treatment
Treatment first focuses on finding and fixing what caused the delirium – for example, treating an infection, changing a medicine, or giving fluids. At the same time, healthcare providers create a calm, safe environment to help the person feel less confused.
Self-care at home
- Stay with the person and speak in a calm, gentle voice
- Keep the room quiet, dimly lit, and free from too many visitors
- Have familiar objects, photos, or a clock visible to help orient them
- Make sure they drink enough water and eat small, regular meals
- Help them move gently (walk a little if safe) to keep them active
Medical treatments
Doctors will treat any infection with appropriate medicines, adjust or stop medicines that may be causing the problem, and correct dehydration or salt imbalances. In some cases, a person may need oxygen or pain relief. Medications for agitation are used only when absolutely necessary and under close supervision.
Living with this condition
After a delirium episode, it can take days or even weeks for the person to return to their normal thinking. Support them with patience, a consistent daily routine, and familiar surroundings. Encourage quiet activities like reading or listening to music.
Lifestyle tips
- Stick to a regular sleep schedule – go to bed and wake up at the same time each day
- Avoid alcohol and limit caffeine, especially in the evening
- Manage stress with relaxation techniques like deep breathing or gentle walking
- Stay mentally active with puzzles, games, or conversation
Diet and exercise
Eat a balanced diet with plenty of fruits, vegetables, and whole grains. Stay hydrated by drinking water throughout the day. Gentle exercise such as walking or stretching helps maintain strength and mood.
Mental health and emotional wellbeing
Delirium can be frightening and distressing for the person and their family. Some people feel anxious, depressed, or have vivid memories of the episode. It is important to talk about these feelings with a healthcare provider or counsellor.
Prevention
Many cases of delirium can be prevented by managing risk factors. This includes keeping older adults physically active, well-nourished, and hydrated, making sure they use their hearing aids or glasses, and reviewing their medicines regularly.
Vaccines
Staying up to date with recommended vaccines, such as the flu vaccine and pneumonia vaccine, helps prevent infections that can trigger delirium.
Screening programmes
A healthcare provider may screen older adults or hospital patients for risk factors like dehydration, poor sleep, and sensory problems, and take steps to address them before delirium develops.
Complications
If left untreated
- Longer hospital stays and slower recovery
- Increased risk of falls and injuries
- Long-term cognitive decline or developing dementia in some cases
- Loss of independence – needing more help with daily tasks
Long-term outlook
With early recognition and treatment, most people recover fully from delirium. Recovery may take weeks, but the condition is often reversible. Even people who recover slowly can improve with time and support. Staying positive and following medical advice gives the best chance of a full return to normal life.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Related conditions
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 16, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
Guidance may differ by country or region. Confirm local recommendations with a qualified healthcare provider.