A constant thirst may be a sign of diabetes, according to Dr Evelyn Lewis.
Those who drink the recommended two litres of water a day, but still feel thirsty, should consider taking a blood glucose test, Dr Lewis said.
“It might be because you’re bingeing on your favourite salty treat, or perhaps working out ultra-hard, but a mouth morphing into the Gobi might actually be your body sending hints of a health condition,” said Dr Lewis, writing in Whimn.
Polydipsia – the medical term for feeling thirsty – is an early symptom of Type 1 diabetes.
When blood sugar levels get too high, the body responds by feeling thirsty. Even though you may drink a lot of fluids, you still feel the need to drink more.
You may also urinate a lot, even though you haven’t had that much to drink.
Dr Lewis said: “When your blood sugar levels are too high, your body pressures your kidneys into producing more urine to get rid of the excess glucose, leading to excessive thirst and frequent peeing.
“Consider a blood glucose test to find out if you’re at risk.”
Other symptoms of polydipsia include a persistent feeling of dryness in your mouth, and exhaustion.
If the polydipsia is caused by diabetes, you may also suffer abnormal weight loss, feeling abnormally hungry and getting frequent sores or infections.
The condition may also be a sign of diabetes insipidous.
Despite the name, diabetes insipidus isn’t linked to diabetes, but the symptoms are similar.
It’s caused by problems with the antidiuretic hormone, who helps to regulate the amount of fluid in the body.
When the hormone isn’t produced as much as it should be, the kidney adds to much water to urine. Patients feel thirsty as the body tries to compensate for the amount of water being lost.
About one in 25,000 people are affected by diabetes insipidus, and adults are more likely to develop the condition.