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Dehydration

People become dehydrated if they don't drink enough water or their body loses too much fluid. The first signs are thirst, trouble concentrating, a headache and dizziness.

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IQWiG is an independent scientific institution in Germany. It is funded through contributions from the German statutory health insurance funds. Its legal responsibilities include the assessment of diagnostic tests and medical treatments. InformedHealth.org is the English-language version of IQWiG’s German website Gesundheitsinformation.de. It provides the general public with independent, ad-free and cost-free information on many common health issues.

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Further topics

Muscle strains

Putting too much stress on a muscle or overextending it can result in a muscle strain. This kind of injury causes immediate pain right after fast or ...

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Osteoarthritis of the knee

Osteoarthritis of the knee causes knee pain – at first, only when the joint is under strain. Things like being overweight or putting a lot of strain ...

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Overactive thyroid (hyperthyroidism)

The thyroid gland regulates a lot of functions in the body. It is said to be overactive if it makes too many thyroid hormones. This can lead to sympt...

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Underactive thyroid (hypothyroidism)

If you constantly feel tired, have a slow pulse and constipation, you may wonder why. These types of symptoms can be caused by various things, but th...

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Hashimoto’s disease

Hashimoto’s disease is a chronic inflammation of the thyroid gland. It is the most common cause of an underactive thyroid in Germany and other countr...

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Gestational diabetes

Women who find out they have pregnancy-related diabetes are often surprised because there are usually no symptoms. But it increases the risk of certa...

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Generalized anxiety disorder

We all feel scared sometimes. This can help protect us in dangerous situations: It makes us more alert so that we can react quickly. But fear can bec...

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Graves’ disease

Graves’ disease is the most common cause of an overactive thyroid. It sends the body’s metabolism into overdrive, making lots of processes (such as t...

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Sinusitis

Sinusitis is an inflammation of the air-filled spaces around the nose. It typically leads to a stuffy nose and pain in the face. Read about what help...

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Shoulder pain

Shoulder pain is one of the most common orthopedic problems. It usually arises beneath the bone that forms the “roof” of the shoulder (the acromion)....

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Deviated septum in the nose (nasal septal deviation)

Nasal septal deviation is when the septum (a thin wall dividing the two air passages in the nose) bends to one side. It can cause snoring, headaches ...

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Vocal nodules

Vocal nodules typically make your voice hoarse, and it may sound raspy and breathy too. These small non-cancerous growths usually go away if you rest...

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Age-related macular degeneration (AMD)

It is normal for vision to gradually get worse with age. Some medical conditions further affect your vision: Age-related macular degeneration makes o...

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Lazy eye (amblyopia) in children

Amblyopia is a common vision problem in children. It is caused when one eye provides sharper images than the other eye does. Because the brain prefer...

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Moles, birthmarks and other types of nevus

Moles, birthmarks and other types of nevus are spots or areas of skin that are darker than the surrounding skin. Some are flat, others are slightly r...

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