Confusion

Overview

Confusion means a person is not thinking clearly, is easily mixed up, or has trouble paying attention and understanding what is going on. It is not a disease on its own. It is a sign that something else may be wrong, such as an infection, dehydration, a medicine side effect, pain, or a health problem affecting the brain. Confusion can come on suddenly (called delirium) or develop more slowly. Sudden confusion is a medical concern and should be checked quickly.

Yes, confusion is common, especially in older adults who are in hospital or unwell. It can happen to anyone at any age, but it is more often seen in frail older people, people with dementia, and people taking several medicines.

Confusion can affect people of all ages. It is more common in older adults, people with dementia, people who are frail or have recently had surgery, and people with long-term health conditions. Children can also become confused when they are very unwell or dehydrated.

Symptoms

Common symptoms

• Trouble concentrating or following a conversation
• Feeling mixed up about where they are, what day it is, or who people are
• Memory problems that are new or worse than usual
• Seeing or hearing things that are not there, or believing things that are not true
• Being restless, agitated, withdrawn, or unusually sleepy
• Slow or muddled speech
• Not recognising familiar people or places
• Changes in sleep, such as being awake at night and sleepy during the day

Symptoms in children

• Being unusually drowsy, floppy, or hard to wake
• Not recognising parents or familiar people
• Being very irritable or upset for no clear reason
• Confusion with fever, vomiting, dehydration, or a recent head injury
• Speech or behaviour that is new and strange to you

Symptoms in older adults

• New confusion or a sudden change in thinking, often the first sign of infection or another illness
• Being more withdrawn or quiet than usual
• Restlessness, especially at night
• Not eating or drinking as usual
• Hallucinations or false beliefs that are new
• A fall or a sudden change in walking or balance

Causes

Main causes

• Infections, especially urinary tract infections, chest infections, and infections in the blood
• Dehydration or not eating and drinking enough
• Side effects of medicines, or interactions between medicines
• Pain, constipation, or not sleeping well
• Low blood sugar, low oxygen, or an imbalance of salts in the body
• Alcohol or drug withdrawal, or alcohol or drug use
• Dementia, including a sudden worsening called delirium
• Stroke, bleeding in the brain, or a head injury
• Liver or kidney problems, or an overactive or underactive thyroid
• Vitamin deficiencies, such as low vitamin B12
• Hearing or vision loss, which can make it harder to understand what is happening
• A change in surroundings, such as a hospital stay or moving to a new place

Risk factors

• Older age, especially over 65
• Dementia or mild memory problems
• Frailty or being very unwell
• Taking several medicines, or recent changes to medicines
• Recent surgery or a hospital stay
• Dehydration, poor nutrition, or trouble swallowing
• infections, pain, or constipation
• Alcohol misuse
• Hearing or vision problems
• Living alone or having little support
• Diabetes, kidney disease, liver disease, or thyroid problems
• Sleep problems or being in an unfamiliar place

When to see a doctor

See a doctor urgently if:

• New confusion that starts suddenly or gets worse quickly
• Confusion with fever, a new cough, burning when passing urine, or a fall
• Confusion after a head injury, even if the person seems fine at first
• Confusion in a child, or in someone who is frail or lives alone
• Confusion after a new medicine or a change in medicine
• Confusion with signs of dehydration or not passing urine

Book a routine appointment if:

• Confusion that comes and goes over weeks or months
• Memory or thinking changes that are getting in the way of daily life
• Confusion that happens mostly at night or in new places
• Family or carers noticing a change in personality, mood, or behaviour
• Concerns about medicine side effects or interactions

Diagnosis

A healthcare professional will ask what has changed, when it started, and whether there are other symptoms. They will usually speak to the person and to someone who knows them well, because this helps show what is new. They will check vital signs, do a physical examination, and review all medicines. They may also check memory and thinking, and look for common causes such as infection, dehydration, pain, or a recent fall.

Tests that may be done

• Blood tests to check blood sugar, salts, kidney and liver function, thyroid, and vitamin levels
• A urine test to look for infection or dehydration
• Blood pressure, pulse, temperature, breathing rate, and oxygen levels
• A blood sugar check
• A review of all medicines, including over-the-counter medicines and supplements
• Memory and thinking checks
• A head scan in some cases, such as after a head injury or if a stroke is suspected
• An ECG (heart tracing) if a heart problem is possible

What to expect at your appointment

The assessment may take time because many things can cause confusion. You may be asked about the person's usual memory and thinking, recent illnesses, falls, medicines, and drinking and eating habits. The healthcare professional may need to repeat checks to see if things are improving or getting worse. If the cause is not clear, they may arrange more tests or a referral to a specialist.

Treatment

Treatment depends on the cause. The main aim is to find and treat the underlying problem, such as an infection, dehydration, pain, or a medicine side effect. Supportive care is also important: a calm, safe environment, familiar faces, good lighting, hearing aids and glasses, and help with eating, drinking, and sleep. If the person is in hospital, staff will monitor them closely and involve family or carers where possible.

Self-care at home

• Stay with the person if it is safe to do so, and keep the surroundings calm and quiet.
• Speak slowly and clearly, use short sentences, and give one instruction at a time.
• Remind the person where they are, what day it is, and who is with them.
• Make sure glasses and hearing aids are clean and working.
• Offer small sips of water regularly, unless a doctor has told you to limit fluids.
• Help with toileting and pain relief, and look out for constipation.
• Keep a simple daily routine and familiar objects nearby.
• Write down any medicines, symptoms, or changes to discuss with a healthcare professional.

Medical treatments

Medical treatment focuses on the cause. This may include treating an infection, correcting dehydration or low blood sugar, treating pain or constipation, reviewing medicines, and helping the person sleep and eat. In hospital, staff may use fluids, oxygen, and close monitoring. Some causes need specific treatment, and the right approach depends on the person and the cause. Never stop or change a medicine without asking a doctor or pharmacist.

When is surgery considered?

Surgery is not usually needed for confusion itself. It may be needed only if a specific cause is found, such as bleeding in the brain or an injury from a fall, and a specialist would discuss this with you.

Living with this condition

Living with confusion can be challenging for the person and for those around them. A calm, predictable routine helps. Keep familiar people and objects nearby, use a clock and calendar, and avoid too much noise or activity at once. It is important to involve the person in simple choices and to treat them with respect. Carers should also look after their own health and ask for help when needed.

Lifestyle tips

• Keep a regular sleep routine and rest during the day if needed.
• Encourage drinking regularly and eating simple, nutritious meals.
• Stay physically active within the person's ability, with help to avoid falls.
• Keep the home safe: good lighting, clear walkways, and no loose rugs.
• Use hearing aids, glasses, and other aids consistently.
• Keep social contact and gentle mental activity, such as looking at photos or listening to music.
• Reduce alcohol and avoid recreational drugs.
• Plan ahead for appointments, medicines, and emergencies with family or carers.

Diet and exercise

A balanced diet and regular fluids support thinking and overall health. Offer small, frequent meals if appetite is poor. Gentle movement, such as short walks or chair exercises, can help circulation, sleep, and mood. A physiotherapist or occupational therapist can suggest safe activity and ways to reduce falls. Ask a healthcare professional for advice if eating, drinking, or moving is difficult.

Mental health and emotional wellbeing

Confusion can cause fear, frustration, embarrassment, and low mood. Carers may feel exhausted, worried, or guilty. These feelings are common and deserve support. Talk to a healthcare professional about how you are feeling. If you or someone you care about is having thoughts of self-harm or suicide, contact your local emergency number or a crisis support service in your country right away.

Prevention

Not all confusion can be prevented, but you can lower the risk by treating health problems early, staying hydrated, eating well, sleeping enough, and reviewing medicines regularly. In hospital, staff use simple steps to reduce confusion, such as keeping people oriented, helping with glasses and hearing aids, encouraging movement, and treating pain and constipation.

Vaccines

Staying up to date with recommended vaccines can lower the risk of infections that may cause confusion. Ask your doctor or pharmacist which vaccines are right for you or the person you care for.

Screening programmes

There is no single screening test for confusion. Regular checks of blood pressure, blood sugar, hearing, vision, and memory can help find problems early. A medicine review with a doctor or pharmacist is especially useful for older adults and anyone taking several medicines.

Complications

If left untreated

• Falls and injuries
• Dehydration and poor nutrition
• Pressure sores and infections
• Longer hospital stays and slower recovery
• Loss of independence and daily function
• Distress for the person and their family
• Worsening memory and thinking problems, especially after delirium

Long-term outlook

Many people recover fully from confusion once the cause is treated, especially if it is found early. Some people, particularly older adults or those with dementia, may have lingering effects on memory or thinking. Recovery can take time, and support helps. With the right care, most people can return to their usual level of function or get close to it.

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