Excessive thirst

It's normal to sometimes feel thirsty, but it's not normal to constantly feel thirsty even when you're drinking a lot. See a GP to find out what's causing your excessive thirst.

Why am I always thirsty?

Most of the time if you're feeling thirsty it's because you need to drink more fluids.

This can happen if you:


Drink more fluids and avoid alcohol or caffeine to see if it helps. If you do not, you may be at risk of becoming dehydrated.

Check if you're dehydrated

Symptoms of dehydration in adults and children include:

  • feeling thirsty
  • dark yellow and strong-smelling pee
  • peeing little and less than 4 times a day
  • feeling dizzy or lightheaded
  • feeling tired
  • dry mouth, lips and eyes

Find out more about dehydration

Non-urgent advice: See a GP if you have excessive thirst and:

  • drinking more fluids for several days has not helped
  • you frequently need to pee
  • you're pregnant

The GP will check if your excessive thirst is being caused by something – for example, diabetes, anaemia or medicines you're taking.

The treatment you have will depend on what's causing your excessive thirst.

Dry mouth or excessive thirst?

You may think you're thirsty when you actually have a dry mouth.

If it's a dry mouth, you may have:

Find out more about dry mouth

Page last reviewed: 9 November 2023
Next review due: 9 November 2026