We all know that when you eat something heavy, exercise hard, and sweat a lot, you get thirsty. It's very normal. When you drink some water at that time, that thirst goes away. But, have you ever had something like this happen to you? No matter how much water you drink, your thirst doesn't go away. You feel thirsty all day, maybe for days on end. If you feel like this, it's not normal. In medicine, we call this condition Polydipsia, or excessive thirst.
What is this excessive thirst (Polydipsia)?
Simply put, Polydipsia is an abnormally frequent thirst for water that exceeds the normal level. This is a response to a lack of fluids in our body. Often, this excessive thirst is accompanied by dry mouth (xerostomia) and frequent urination (frequent urination).
Water is essential for our body to function. That's why it's important to drink the right amount of water every day. But in the case of Polydipsia, which we're talking about, you feel like you can't quench your thirst no matter how much water you drink. This can last for days, weeks, or even months.
If this type of excessive thirst persists, it may be an early sign of a serious medical condition such as diabetes.
What are the causes of excessive thirst?
As well as the common causes of excessive thirst, there are also medical reasons that we should be particularly concerned about. Let's look at both of these separately.
Common causes encountered in everyday life
There's nothing to worry about, these are usually temporary.
- Eating spicy or salty foods: We know that eating things like pickles and dried fruits can make you very thirsty.
- Drinking too much caffeine or alcohol: Things like coffee, tea, and beer dehydrate the body.
- Sweating excessively after exercise: Thirst occurs because water and salts are lost from the body along with sweat.
- Illnesses like fever, diarrhea, and vomiting: A large amount of fluid is also lost from the body during this time.
- Pregnancy: Thirst may increase with the changes taking place in the body during this time.
- Certain medications: Some medications can cause dry mouth and thirst as a side effect.
Reasons for medical concern
If your excessive thirst doesn't subside after a few days, it could be due to a serious underlying condition. Here are some of the possible causes.
| Condition | Simply explained |
|---|---|
| Diabetes (Diabetes Mellitus) | This is the main and most common medical cause of excessive thirst. When blood sugar levels are high (hyperglycemia), the kidneys try to excrete the extra sugar through urine. This causes frequent urination, dehydration, and excessive thirst. |
| Diabetes Insipidus | Although its name is similar to diabetes, it has nothing to do with blood sugar. It is a disease related to the kidneys and hormones. It causes excessive thirst because the body passes large amounts of urine uncontrollably. |
| Dehydration | Not drinking enough water for several days can lead to severe dehydration, which is another cause of excessive thirst. |
| Psychological causes (Psychogenic Polydipsia) | Some mental illnesses (e.g. anxiety, schizophrenia ) can cause an uncontrollable urge to drink water. |
| Potassium deficiency (Hypokalemia) | Low potassium levels in the blood can also affect kidney function and increase thirst. |
| Other reasons | In cases such as burns, sepsis, kidney, liver, or heart failure, the body's fluid balance can be disrupted and excessive thirst can occur. |
When should we see a doctor?
If you are experiencing one or more of the symptoms below along with your excessive thirst, it is imperative that you seek medical advice without wasting time.
- If your thirst doesn't subside even after drinking plenty of water for a few days.
- If you urinate frequently and in large amounts (in medicine, we call this `polyuria`).
- If your vision feels blurry, it means ``blurry vision''.
- If you feel extremely tired and exhausted for no reason.
- If you feel unusually hungry (polyphagia).
If all three of these symptoms, especially excessive thirst, excessive urination, and excessive hunger, occur together, it can be a strong sign of diabetes.
When you go to see a doctor, he will ask you a few questions, do a physical exam, and try to find the cause. For example,
- How long has this been going on?
- Did it start suddenly, or did it increase gradually?
- Has your eating habits changed?
- Did you lose weight or gain it?
Then, to find out the exact cause, you may be asked to do several things, such as a blood test (blood glucose, electrolytes), and a urine test (urinalysis).
The treatment depends on the cause of your excessive thirst. If it is diabetes, treatment will be started to control your blood sugar. If it is caused by another medication, the doctor will decide to change the dosage of that medication or give you a different medication. Therefore, the best thing to do is to see a doctor as soon as possible and find out the cause.
Take-Home Message
- There are two types of thirst: normal thirst and excessive thirst (polydipsia), which is not quenched no matter how much you drink.
- Constant excessive thirst can be a major symptom of a serious medical condition, such as diabetes.
- Don't ignore symptoms such as frequent urination, blurred vision, and extreme fatigue, along with excessive thirst.
- If you have this kind of unusual, persistent thirst, don't guess, but definitely see your doctor to get the right cause and treatment.
👩🏽⚕️ Additional questions (FAQs)
💬 What is excessive thirst (Polydipsia)? How is it different from normal thirst?
It's normal to drink water after working out in the sun/sweating. But 'Polydipsia' means that even if you drink 4-5 liters of water a day, you still have an extremely dry mouth and an unbearable thirst! This thirst cannot be quenched by drinking water, this is the biggest warning sign of a very serious and dangerous disease inside the body!
💬 What are the main reasons for not being thirsty (Polydipsia) no matter how much water you drink?
The main and most dangerous cause of this in the world is 'Diabetes Mellitus'! When the blood sugar level increases, the body excretes gallons of urine to get rid of it. Then, the body retains water, so the brain tells it to keep drinking water! The other cause is 'Diabetes Insipidus (a kidney or brain disease).' Also, people who take antidepressants, people with high blood calcium (Hypercalcemia), and people who drink water mentally (Psychogenic polydipsia) also experience this severe thirst.
💬 What are the 'Red Flags' that indicate you should see a doctor if you are extremely thirsty?
Along with thirst, if you 1) urinate more than 10 times a day (Frequent Urination/Polyuria), 2) suddenly lose weight for no reason (Unexplained weight loss), 3) have blurred vision and dizziness, and are unbearably tired/drowsy (Fatigue), it could definitely be a fatal case of diabetes (DKA / blood sugar over 600), so you need to get a blood test (Fasting Blood Sugar / HbA1c) today!
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