Someone living with dementia may finish a meal, leave their drink untouched and never realise they are becoming dehydrated. What looks like a simple refusal to drink can sometimes signal something more complex, from changes in memory and thirst recognition to difficulties with swallowing. The challenge for families is knowing when to be concerned, especially when dehydration can make confusion and other dementia symptoms worse. So, why does dementia affect drinking habits, what warning signs should you look for, and how can you help someone stay hydrated without causing distress?
Why Can Dementia Make Someone Stop Drinking?
Drinking involves several abilities that dementia can affect. A person needs to recognise thirst, remember to get a drink, identify what is being offered and manage the physical action of drinking. Difficulties with any of these steps can reduce fluid intake.
Memory loss is one possible reason. Someone may forget to drink between meals or lose track of whether they have already had a glass of water. They might also have difficulty recognising thirst or communicating it to another person. This means that waiting for someone to ask for a drink is not always reliable.
Changes in perception and coordination can create further barriers. A person might not recognise a glass as a drink, struggle to see clear water or find a cup too heavy to lift comfortably. Some people also experience changes in taste and begin preferring different flavours or temperatures.
Physical discomfort should not be overlooked. Toothache, sore gums, mouth ulcers, oral thrush or poorly fitting dentures can make drinking unpleasant. In the later stages of dementia, swallowing difficulties may also develop. These are not simply changes in preference; they may indicate a problem that needs professional assessment.
As Dementia UK explains in its guidance on hydration, several factors can contribute to dehydration, including difficulty recognising thirst, reduced concentration, changes in taste and problems swallowing.
What Are the Signs of Dehydration in Someone With Dementia?
Dehydration develops when the body loses more fluid than it takes in. It can affect normal bodily functions, including temperature regulation, circulation and digestion. The signs vary according to how much fluid someone has lost, so families should look for changes rather than relying on one symptom.
Some signs are physical. The person's mouth or lips may become dry, their urine may become darker than usual, and they may pass urine less frequently. They might also experience headaches, dizziness, tiredness or constipation.
Other signs can be less obvious. Someone may become unusually quiet, appear vacant, lose interest in activities or seem more unsettled than normal. Increased confusion and changes in mood can also occur. These behavioural changes matter because a person with dementia may not be able to describe how they feel. Instead of saying they are dizzy or have a headache, they may withdraw from conversation or become frustrated.
Can Dehydration Make Dementia Symptoms Worse?
Yes. Dehydration can make existing cognitive difficulties more noticeable. Someone who usually manages familiar conversations or daily activities may become more confused, tired or withdrawn when they are not taking in enough fluid.
This can create a difficult situation for families. Changes in memory, communication and behaviour may already be associated with dementia, so it can be tempting to attribute every new symptom to the condition. However, a sudden deterioration should not automatically be viewed as dementia progressing. One important concern is delirium. This is a sudden change in mental state that can involve confusion, poor concentration, altered awareness, agitation or withdrawal. It can develop over hours or days and may be triggered by physical illness, infection or dehydration.
Delirium is different from the gradual changes generally associated with dementia. A person who becomes suddenly confused, unusually drowsy or significantly different from their normal behaviour needs urgent medical assessment. The NHS advises seeking immediate medical help for sudden confusion. Dehydration can also contribute to constipation, headaches and urinary tract infections. These problems may cause further discomfort and affect how someone feels and behaves. Addressing reduced fluid intake is therefore about more than preventing thirst; it can help reduce additional health problems.
Why Might Someone Refuse a Drink Even When They Need One?
Repeatedly refusing water does not necessarily mean someone is being difficult or deliberately avoiding fluids. The response may reflect confusion, discomfort, fear or a difficulty they cannot explain. For example, someone who no longer recognises a glass of water may turn it away because they do not understand what is being offered. Another person may dislike the taste or temperature. If their preferences have changed, a drink they previously enjoyed may no longer appeal to them.
The circumstances around drinking can matter too. A noisy room, unfamiliar cup or rushed interaction may make the experience uncomfortable. Someone who struggles to concentrate may lose interest before finishing a drink. It is also worth considering whether the person is worried about needing the toilet. Concerns about incontinence, difficulty reaching the bathroom or needing help can lead some people to limit what they drink.
Swallowing problems require particular attention. Coughing during drinks, choking, a wet-sounding voice or holding liquid in the mouth may indicate dysphagia. If these signs appear, speak to the person's GP. A speech and language therapist can assess swallowing and advise on safe ways to manage food and fluids.
Understanding the reason behind refusal is more useful than repeatedly asking someone to drink. It allows families and carers to respond to the difficulty rather than treating the refusal as the problem itself.
How Can Families Help Someone With Dementia Drink More?
The most helpful approach is to make drinking a familiar and manageable part of the day. Rather than waiting for the person to express thirst, offer drinks at regular opportunities, such as with meals, after activities and during visits.
Presentation can make a difference. A familiar mug may be easier to recognise than an unfamiliar glass, while a lightweight cup may be more comfortable to hold. Some people find brightly coloured cups easier to see; others prefer a clear glass. It may take time to discover what works best for the individual. Choice is equally important. If someone turns down water, try offering another suitable drink they enjoy. Tea, coffee, milk, squash and other non-alcoholic drinks can contribute to fluid intake. Foods with a high water content, including soup, yoghurt, jelly and some fruits, can also provide fluids.
Drinking can become easier when it is part of a shared activity. Sitting together with a cup of tea, rather than simply placing a glass in front of someone, can provide encouragement without making the person feel pressured. Allowing enough time and offering smaller amounts more frequently may also help. The aim is to support independence wherever possible. If someone can hold their cup but needs help positioning it, provide only the assistance they require. If they become distressed, stop and try again later. Forcing someone to drink can increase distress and may create a choking risk.
There is no single fluid target that is appropriate for everyone. General guidance often refers to six to eight glasses of fluid a day, but individual requirements can vary. People with certain heart or kidney conditions may have specific fluid restrictions. Families should follow advice from the person's healthcare team, particularly if swallowing difficulties are present.
When Should You Seek Medical Advice?
A short period of reduced drinking may have a straightforward explanation, but persistent refusal or signs of dehydration should not be ignored. Contact the person's GP or NHS 111 if they are passing less urine, experiencing ongoing dizziness, showing signs of dehydration or repeatedly refusing fluids.
Swallowing difficulties also need assessment, particularly if someone coughs or chokes when drinking. Do not independently change the thickness of drinks or introduce specialist drinking equipment without professional advice. A speech and language therapist can assess swallowing and recommend appropriate support.
Sudden confusion needs more urgent attention. If someone becomes acutely confused, significantly less alert or difficult to wake, seek emergency medical help. The NHS guidance on sudden confusion advises immediate assessment because it can have several causes requiring prompt treatment.
It is also important to consider what has changed recently. A fever, vomiting, diarrhoea, infection, pain or a change in medication may affect fluid intake or increase fluid loss. A healthcare professional can help identify the cause rather than assuming that dementia alone explains the problem.
Frequently Asked Questions
Can dementia affect a person's sense of thirst?
Yes. Dementia can affect the ability to recognise thirst, remember to drink or communicate the need for fluids. This means someone may become dehydrated without asking for water.
Does dehydration cause sudden confusion in someone with dementia?
It can contribute to sudden confusion and delirium. However, sudden confusion can have several causes, including infection and other illnesses, so it needs urgent medical assessment.
What can someone with dementia drink instead of water?
Suitable alternatives include tea, coffee, milk, squash and other preferred non-alcoholic drinks. Foods such as soup, yoghurt and jelly can also contribute to fluid intake. Any swallowing or medical restrictions should be discussed with a healthcare professional.
How do you encourage someone with dementia who refuses drinks?
Try offering familiar drinks in a preferred cup, at a comfortable temperature and in a calm setting. Smaller amounts offered regularly may be easier to manage. If refusal continues, seek medical advice to check for pain, illness or swallowing difficulties.
Can dehydration lead to a urinary tract infection in older people?
Dehydration can contribute to urinary problems and is associated with an increased risk of UTIs. If someone develops new urinary symptoms, fever or sudden confusion, contact a healthcare professional for assessment.
Supporting People Living With Dementia at Thornfield Care Home
Every person living with dementia has their own needs, preferences and daily routines. At Thornfield Care Home in Seaton, we understand how important it is to provide care that respects each resident as an individual, while helping them feel comfortable, supported and valued.
If you are exploring dementia care for someone close to you, we would love to welcome you to Thornfield. You are very welcome to visit, meet our team and see the home for yourself. If you have questions or would simply like to talk through your loved one's needs, please do not hesitate to contact us. We would be happy to help you understand the support we can offer.
