Features
Fever in children
MBBS(Cey), DCH(Cey),
DCH(Eng), MD(Paed), MRCP(UK), FRCP(Edin), FRCP(Lond), FRCPCH(UK),
FSLCPaed, FCCP, Hony. FRCPCH(UK), Hony. FCGP(SL)
Specialist Consultant Paediatrician and Honorary Senior Fellow, Postgraduate Institute of Medicine, University of Colombo, Sri Lanka.
Joint Editor, Sri Lanka Journal of Child Health Section Editor, Ceylon Medical Journal
Fever is a common symptom of a variety of diseases in children. At the outset, it is very important to clearly understand that it is only a symptom and not a disease in its own right. When the body temperature is elevated above the normal level of around 98.6 degrees Fahrenheit (F) or 37 degrees Celsius (C), the condition is referred to as fever. It is a significant accompanying symptom of a plethora of childhood diseases. All children would get a fever at some time or another in their lives, and in the vast majority of cases, this is due to rather mild illnesses, and they are completely back to normal within a few days. Some may have a rather low-grade fever, while others may have quite a high fever. However, in certain situations, fever may be an important indication of an underlying serious problem. The significance depends entirely on the circumstances under which this occurrence is seen.
Irrespective of the actual underlying reason for the fever, the basic mechanism of causation of fever is the temporary resetting of the temperature-regulating thermostat of the brain to a higher level. The consequences are that the heat generated within the body is not effectively dissipated. It is merely a body response to a harmful agent and is a very important defence mechanism. Turning up the core temperature is the body’s way of fighting the germs that cause infections and making the body a less comfortable place for them. However, less commonly, it is also a manifestation of other inflammatory disorders in children. The significance of fever in such situations is a little bit different to that which is seen as a response to an infection.
The part of the human brain that controls body temperature is not fully developed in young children. This means that a child’s temperature may rise and fall very quickly and the child is also more sensitive to the temperature of his or her surroundings. Although parents often worry and get terribly scared with the child developing fever, it does not cause any harm by itself. It is a good thing in the sense that it is often the body’s way of fighting off infection.
It is quite important to note that the actual level of the temperature is not always a good guide to how ill the child is. A simple cold or other viral infection can sometimes cause a high fever in the region of 102 to 104 degrees Fahrenheit or 39 to 40 degrees Celsius. However, this does not always indicate a serious problem. It is also true to say that some more sinister infections could sometimes cause a much lower rise in the body temperature. Because fevers may rise and fall, a child with a fever might experience chills and shivering as the body tries to generate additional heat as the body temperature begins to rise. This may be followed by sweating as the body releases extra heat when the temperature starts to drop. Children with fever often breathe faster than usual and generally have a higher heart rate. However, fever accompanied by obvious difficulties in breathing, especially if the breathing problems persist even at times the temperature is normal is of significance and requires urgent medical evaluation of the situation. Generally, in the case of children, the way they act is far more important than the reading on the thermometer, and most of the time, the exact level of a child’s temperature is not particularly important, unless it is persistently very high.
Although many fevers need just simple remedies, under certain conditions the symptom of fever needs rather urgent medical attention. This is the case in babies younger than three months. Same is true even in a bigger child if the fever is accompanied by uncontrollable crying or pain in the neck with a severe headache. Marked coughing and or difficulty in breathing coupled with fever needs to be medically sorted out. Fever combined with pain and difficulty in passing urine, significant tummy pains or marked vomiting and diarrhoea too would need medical attention. Reddish rashes and bluish spots on the skin with fever also need to be seen by a doctor. The illness is probably not serious if a child with a history of fever is still interested in playing, is eating and drinking well, is alert and smiling, has a normal skin colour and looks well when his or her temperature comes down. However, even with rather low levels of fever, under certain conditions, medical attention should be sought. In situations such as when the child seems to be too ill to eat and drink, has persistent vomiting or diarrhoea, has signs of dehydration, has specific complaints like a sore throat or an earache or when fever is complicated by some other chronic illness, it is prudent for him or her to be seen by a qualified doctor.
One could take several steps to bring down a fever. It is very useful to remove most of the clothes and keep under a fan to facilitate heat loss from the body. If there is no fan available, one could try fanning with a newspaper. A very effective way of bringing down a temperature is to sponge the body with a towel soaked in water. The water must be at room temperature or a bit higher. One should not use ice or iced water on the body. Ice will lead to contraction of the blood vessels of the skin and the purpose would be lost as more heat will be conserved within the body. There is no evidence that ice on the head helps to bring down the fever or to prevent a convulsion. If a medicine is to be used, paracetamol is probably as good as any other drug, but the correct dosage according to the instructions on the container should be used for optimal benefit. The best way of calculating the appropriate dose is by using the body weight. It is very important to stress that aspirin and aspirin-containing medications should not be used in children, merely to bring down a fever.
A child with fever loses a considerable amount of fluid from the body, particularly due to sweating. It is beneficial to ensure that the child drinks plenty of fluids. A good index of the adequacy of fluid intake is the passing of normal amounts of urine. A reduced solid food intake would not matter that much just for a couple of days of fever, but in prolonged fevers adequate nutrition too becomes quite important. A child with a high temperature also needs rest and sleep. They do not have to be in bed all day if they feel like playing, but they must have the opportunity to lie down. Sick children are often tired and bad-tempered. They sleep a lot, and when they are awake, they want their parents around all the time. Perhaps it is quite useful to spoil them a little bit when they are ill and to read to them, play with them or just spend time with them. It is best to keep a child with a fever home and not send him or her to school or child care. Most doctors would agree that in simple fevers, it is quite satisfactory for the child to return to school or child care when the temperature has been normal for over 24 hours.
Trying to get the temperature down would make the child more comfortable. However, it is not essential to get it down to normal and to keep it there scrupulously. Parents often worry that either the fever simply refuses to abate or springs up again after a couple of hours. It must be realised that certain fevers have to run their course and will not come down to normal in a hurry, despite whatever measures that are undertaken. This is particularly true of viral fevers. Some parents are terribly worried at the slightest elevation of the temperature and go running to doctors looking for a “magic cure” for the fever. Many fevers do not need urgent medical attention and one could watch it for a few days and see how it progresses. Yet for all that, if there are some worrying signs then it is advisable to seek advice from a qualified doctor.
It is a familiar occurrence that many people believe that a high fever is quite dangerous. Fever by itself has no major long-lasting effects. If one appreciates that high fever is just a symptom and that it is only a reaction of the body to something untoward going on, then it is easy to consider it to be just like any other symptom of a disease. Some are also under the misconception that a high fever could cause a convulsion. This is not always the case, and a convulsion would occur only in those children who have the constitutional tendency to get them. Convulsions are not always related to high fever, and in those who are susceptible, even moderate and sometimes mild fever could trigger a convulsion. High fever does not lead to lasting brain damage in its own right either. Fever is sometimes an indication of a significant infection, but in those circumstances, the primary disease itself is the real problem. In situations where medical help is desirable, what is most important is the way a fever is sorted out and some kind of a diagnosis being made as to the real cause of the fever. The crucial component of the treatment of a fever caused by an underlying problem is the treatment of the root cause.