A high grade fever is defined as a body temperature of 103 degrees Fahrenheit (39.4 degrees Celsius) or above. Most fevers subside on their own within 1 to 3 days. A persistent or recurring fever might remain or return for up to 14 days. These symptoms are usually caused by one of four different viruses: influenza virus, rhinovirus, coronavirus, or adenovirus.
The flu can cause sudden changes in temperature due to its influence on the immune system. The virus can also cause other symptoms not commonly associated with fever, such as a sore throat, cough, headache, muscle pain, fatigue, and nausea. Fever is common in people with flu infections but it can also be found in people without any apparent cause for the fever. In fact, about 10% of people with flu-like symptoms have this unrelated fever.
Children may experience multiple bouts of fever. Each time the body temperature rises, it triggers the immune system to produce more antibodies to fight off the infection. So although children may experience several episodes of fever, they usually make a full recovery between attacks. Adults often only have one fever episode because they're already immune to most illnesses. However, adults can still get very sick if they develop secondary infections during their fever phase. Children are at risk for developing complications from repeated infections, so keeping them healthy by being up to date on vaccines and getting regular checkups from the doctor is important.
Even if it is only a little fever, a fever that lasts longer than usual might be dangerous. It could be a sign of a serious disease such as malaria, tuberculosis, or cancer.
Children can have prolonged fevers, too. So can adults. It all depends on the cause of the fever. If your child has a fever that won't go away, call your doctor immediately before giving him or her acetaminophen (such as Tylenol). The pain reliever may not work as well if your child's temperature remains high after making it down from the brain or spinal cord.
If you think your child may have a virus causing the fever, don't give him or her aspirin or other salicylates until you talk to your doctor first. These drugs can cause asthma-like symptoms or make existing heart problems worse. Aspirin also causes bleeding in children, so stop any bleeding from minor cuts right away if you are worried about this happening.
Children with recurrent fevers might have chronic conditions such as allergies, autoimmune diseases, metabolic disorders, organ damage, or infections that keep coming back. See your doctor for an accurate diagnosis that can then be treated.
Adults usually experience a fever when their body temperature rises above 100.4 °F (38 °C). This is referred to as a "low-grade fever." A high grade fever is defined as a body temperature of 103°F (39.4°C) or above. Children may have a fever without feeling hot or cold. Their body temperature may be checked with a thermometer.
The type of fever you have depends on what part of the body is making the heat. If your blood moves through small capillaries, such as those in your skin, then you have a red hot sensation. The sweating also helps to lower your temperature. Without sweating, you would die before your body could cool down.
You can think of the human body like a house. There are three ways to keep it warm: 1 insulation - layers of clothing worn by people who live in cold places; 2 air conditioning - machines used to produce a cooling effect; 3 heat generated by bodies functions - such as our hearts pumping out blood that heats up during exercise or digestion.
A fever is caused by your body trying to fight off an infection. Your immune system triggers the production of more white blood cells and proteins which help destroy harmful bacteria and viruses. In addition, hormones released during stress changes can cause fever even when there's no detectable source of infection.
The length of a fever is determined by the intensity of the assault and the ability of your immune system to completely treat it. As a result, it might range from 2 days to several weeks. In the next section, we'll look at the question "how long does a fever last?"
A person with a normal immune system will recover from a fever within 24 hours. A person who is immunocompromised (for example, due to cancer treatment or HIV/AIDS) may have a longer duration of fever.
Children tend to have shorter fieves than adults do. For example, children's fevers usually last only 3-7 days instead of 3-10 days for adults. The same principle applies to older people: their fevers usually last less time than those of younger people do.
People with mild infections can usually manage without seeing a doctor. People with more serious conditions may need to be hospitalized so that they can be monitored carefully and any necessary treatments started immediately.
In most cases, the cause of a fever is not known before a patient sees his or her doctor. Doctors often conduct various tests to find out what is causing the body to attack itself. If someone has a recurring fever, doctors may want to check to see if there is a virus involved. This can be done by taking a sample of urine or saliva or looking at blood cells.