Photo: Jill Burrow

Why am I dehydrated when I drink a lot of water?

This is known as hyponatremia and it's caused by low sodium (salt) levels in the blood. It can occur if too much water is drunk over a short period of time. Hyponatremia sometimes affects athletes whose blood sodium level is reduced through sweat and then diluted by drinking large amounts of water.

nhsinform.scot - Dehydration - Illnesses & conditions - NHS inform

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Dehydration occurs when your body loses more fluid than you take in.

When the normal water content of your body is reduced, it upsets the balance of minerals (salts and sugar) in your body, which affects the way it functions. Water makes up over two-thirds of the healthy human body. It lubricates the joints and eyes, aids digestion, flushes out waste and toxins, and keeps the skin healthy.

Some of the early warning signs of dehydration include:

feeling thirsty and lightheaded

a dry mouth

tiredness

having dark coloured, strong-smelling urine

passing urine less often than usual

A baby may be dehydrated if they:

have a sunken soft spot (fontanelle) on their head

have few or no tears when they cry

have fewer wet nappies

are drowsy

The body is affected even when you lose a small amount of fluid.

What causes dehydration?

Dehydration is usually caused by not drinking enough fluid to replace what we lose. The climate, the amount of physical exercise you are doing (particularly in hot weather) and your diet can contribute to dehydration. You can also become dehydrated as a result of an illness, such as persistent vomiting and diarrhoea, or sweating from a fever.

Who is at risk from dehydration?

Anyone can become dehydrated, but certain groups are particularly at risk. These include: babies and infants – they have a low body weight and are sensitive to even small amounts of fluid loss older people – they may be less aware that they are becoming dehydrated and need to keep drinking fluids

people with a long-term health condition – such as diabetes or alcoholism

athletes – they can lose a large amount of body fluid through sweat when exercising for long periods

What to do

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If you're dehydrated, drink plenty of fluids such as water, diluted squash or fruit juice. These are much more effective than large amounts of tea or coffee. Fizzy drinks may contain more sugar than you need and may be harder to take in large amounts. If you're finding it difficult to keep water down because you're vomiting, try drinking small amounts more frequently. Infants and small children who are dehydrated shouldn't be given large amounts of water alone as the main replacement fluid. This is because it can dilute the already low level of minerals in their body too much and lead to other problems. Instead, they should be given diluted squash or a rehydration solution (available from pharmacies). You might find a teaspoon or syringe can be helpful for getting fluid into a young child. If left untreated, severe dehydration can be serious and cause fits (seizures), brain damage and death.

When to see your GP

See your GP if your symptoms continue, despite drinking plenty of fluids, or if you think your baby or toddler is dehydrated. If your GP suspects dehydration, you may have a blood test or a urine test to check the balance of salts (sodium and potassium) in your body.

extreme thirst

feeling unusually tired (lethargic) or confused

not passing urine for eight hours

rapid heartbeat

dizziness when you stand up that doesn't go away after a few seconds You should also contact your GP if your baby has had six or more episodes of diarrhoea in the past 24 hours, or if they have vomited three times or more in the past 24 hours.

nhsinform.scot - Dehydration - Illnesses & conditions - NHS inform

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