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threatening illness or injury

Fever

Here you can find information about diseases, symptoms, and health related to fever.

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Written by

Picture of Philipp Skafte-Holm

Philipp Skafte-Holm

Læge

Bjarne Lühr Hansen

Bjarne Lühr Hansen

Praktiserende læge, ph.d.

Last edited on March 20, 2026

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Fever Skin

Diseases

Bird Flu

A special type (H5N1) of bird flu spreads across the world among birds and can – in very rare cases – infect people. aAlot of people have got infected and

Common Cold

Common cold is caused by a viral infection in the mucous membrane of the nose. Stuffy and running nose, sneezing, coughing and headache are typical signs of

Cystitis

Cystitis appears as frequent and smarting urination. Drink plenty of fluid. Urination after intercourse can prevent cystitis from arising. Fever and chills can

Diarrhoea and Vomiting

Fever, diarrhoea and vomiting indicate a gastrointestinal infection. Give the child plenty of fluid with salt, sugar and lactic acid bacteria. If the child is

Fever

Fever is not dangerous; if the child’s general condition is good. A child with fever should be undressed and have plenty of fluid. You should call the doctor

Gallstone

Many people has gallstone without noticing it. A gallstone attack appears as pain in the upper right part of the stomach, just below the ribs, and vomiting.

Influenza

It varies a lot how ill people become from influenza. Especially older people and people with a weak heart or smoker’s lungs become very ill. It is recommended

Kidney Stones

Kidney stones is a common illness that appears as pains in the loin, the side or in the bottom of the stomach. The pain is very strong and can cause nausea and

Meningitis

Meningitis (cerebrospinal meningitis) is a rare but very serious illness. The cause is either virus or bacteria. It is the bacterial inflammation that causes

Mononucleosis (Mono)

Mono is a viral infection. The illness is especially seen with teenagers and adults. It appears as fever, a sore throat and swollen lymph glands. You should

Pelvic Inflammatory Disease

Pelvic inflammatory disease can arise following an abortion or birth. However, also women with changing partner who do not use a condom have a risk of

Pneumonia

Pneumonia is a common illness with older people. Fever, cough, trouble with breathing and chest pains are signs of pneumonia. All who has pneumonia has a

Sinusitis

Sinusitis is often seen in connection with a common cold. Normally, sinusitis can be treated with medication bought over the counter. If it does not help, you

Slapped Cheek Syndrome

When a pregnant woman is infected with slapped cheek syndrome, there is a risk that the foetus may die. Most pregnant women has had slapped cheek syndrome as a

Tick Bite

A tick can transmit the bacteria Borrelia. You can remove the tick by yourself. Contact the doctor if you have a ring-shaped rash or paralyses.

Tonsillitis

Most often, tonsillitis is caused by a virus and should not be treated with penicillin. By a grafting from your throat, your doctor can determine whether

Symptoms

Diarrhoea and Vomiting

Fever, diarrhoea and vomiting indicate a gastrointestinal infection. Give the child plenty of fluid with salt, sugar and lactic acid bacteria. If the child is

Fever

Fever is not dangerous; if the child’s general condition is good. A child with fever should be undressed and have plenty of fluid. You should call the doctor

Health