Diabetes insipidus

Overview

Diabetes insipidus is a rare condition where your body loses too much fluid through urine, making you extremely thirsty and need to urinate frequently. It is not related to diabetes mellitus (blood sugar diabetes).

No, diabetes insipidus is rare. It affects about 1 in 25,000 people.

It can affect people of any age, but certain types are more common after head injury, brain surgery, or in people with kidney problems or taking certain medications.

Symptoms

Common symptoms

• Extreme thirst (polydipsia) that is hard to quench
• Passing large amounts of pale urine (polyuria) – often every 30 minutes to 2 hours
• Waking up many times at night to urinate (nocturia)
• Signs of dehydration, such as dry mouth, dry skin, and feeling tired

Symptoms in children

• Bedwetting or very wet nappies
• Irritability and crying from thirst
• Poor feeding or weight loss
• Fever and constipation from dehydration

Symptoms in older adults

• Confusion or disorientation, especially if dehydrated
• Dizziness or fainting when standing up
• Urinary incontinence (leaking urine)
• Dry, loose skin and sunken eyes

Causes

Main causes

• Central diabetes insipidus: damage to the hypothalamus or pituitary gland in the brain – from a head injury, brain surgery, infection, or a tumour.
• Nephrogenic diabetes insipidus: the kidneys cannot respond to ADH – caused by genetic conditions, certain medicines (like lithium), high calcium levels, or chronic kidney disease.
• Gestational diabetes insipidus: a temporary form that happens during pregnancy when the placenta makes an enzyme that breaks down ADH.

Risk factors

• Head trauma or brain surgery
• Family history of diabetes insipidus (especially some genetic forms)
• Taking certain medicines such as lithium or diuretics
• Having a condition that affects the kidneys, such as polycystic kidney disease
• Pregnancy (rarely)

When to see a doctor

See a doctor urgently if:

• If you have extreme thirst and need to urinate many times an hour for more than a few days
• If you feel dizzy, lightheaded, or confused along with excessive thirst and urination

Book a routine appointment if:

• If you have been noticing you are much thirstier than usual and urinating more often for weeks
• If your child is bedwetting again after being dry, or your older relative becomes suddenly confused and dehydrated

Diagnosis

A doctor will ask about your symptoms, medical history, and family history. They will check for signs of dehydration and may order blood and urine tests.

Tests that may be done

• Water deprivation test: you stop drinking for several hours under medical supervision, and doctors measure your urine output and concentration.
• Blood tests: to check sodium levels, kidney function, and measure ADH.
• Urine tests: to see how concentrated your urine is.
• MRI scan of the brain: to look at the pituitary gland and hypothalamus.

What to expect at your appointment

The water deprivation test can take several hours. You may need to stay in a clinic or hospital unit. The doctors will monitor you closely and stop the test if you become dehydrated. After the diagnosis, you will be referred to a specialist, often an endocrinologist (hormone doctor) or a kidney specialist.

Treatment

Treatment depends on the type and cause. The goal is to reduce thirst and urination, prevent dehydration, and manage any underlying conditions.

Self-care at home

• Drink enough water to replace the fluid you lose – carry a water bottle and sip regularly.
• Avoid alcohol and caffeine, which can make you urinate more.
• Limit salty or high-protein foods, as they can increase your need for water.
• Monitor your weight and urine output daily (if advised by your doctor).

Medical treatments

For central diabetes insipidus, treatment usually involves taking a medication that replaces the missing hormone (a synthetic form of ADH). For nephrogenic diabetes insipidus, doctors may recommend a low-salt diet and drugs that help the kidneys concentrate urine. Some people benefit from diuretics (water pills) given in a specific way to reduce urine output. Any medication should be started and adjusted only under a doctor's supervision.

When is surgery considered?

If diabetes insipidus is caused by a tumour or growth in the brain, surgery to remove that growth may be needed. This is usually done by a neurosurgeon.

Living with this condition

Diabetes insipidus is a long-term condition for most people, but with proper management you can live a full life. You will need to plan ahead for access to water and toilets, especially during travel, work, or exercise.

Lifestyle tips

• Tell your friends, family, and employer about your condition so they can support you.
• Carry a medical ID card or wear a bracelet alerting others to your need for water and possible medication.
• Learn to recognize early signs of dehydration (dry mouth, dark urine, dizziness) and drink before you feel thirsty.

Diet and exercise

Eat a balanced diet with moderate salt and protein. Drink extra water before and during exercise. Avoid heavy sweating – choose cooler times of day and stay in the shade.

Mental health and emotional wellbeing

Having extreme thirst and needing to urinate often can be frustrating, embarrassing, and exhausting. It may affect sleep, work, and social life. It is normal to feel anxious or stressed. Talk to your doctor about these feelings – they can refer you to counselling or support groups.

Prevention

Most cases of diabetes insipidus cannot be prevented, especially those caused by genetic conditions or spontaneous brain problems. You can reduce your risk of head injury by wearing seatbelts and helmets, and by avoiding heavy alcohol use that could lead to falls.

Screening programmes

There is no routine screening test for diabetes insipidus. It is diagnosed when symptoms appear.

Complications

If left untreated

• Severe dehydration, which can be life-threatening
• Electrolyte imbalances, especially high sodium levels in the blood (hypernatremia), which can cause confusion, seizures, or coma
• Long-term kidney damage from constant overwork
• Poor growth and development in children

Long-term outlook

With proper treatment and self-care, most people with diabetes insipidus can control their symptoms and lead a normal, healthy life. It is a manageable condition, and your healthcare team will work with you to find the best plan.

Find support

External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.