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A temperature of 37 °C often causes concern, especially if it lasts for several days, returns in the evening, or appears without obvious symptoms. In such cases, it is important not to rush into self-treatment and not to lower the readings “just in case,” but to monitor your well-being, accompanying signs, and the duration of the condition.

In this article, we will explain when a body temperature of 37 may be a normal variant and when it requires a doctor’s attention. We will explain which causes may support a slight increase in the reading, what can be done at home without harming health, and which symptoms should not be ignored when deciding to undergo an examination.

What is a subfebrile temperature

A subfebrile temperature is an increase in body temperature approximately within the range of 37.1–38 °C, which may last for several days, weeks, or recur periodically. It is not a separate diagnosis, but indicates the body’s reaction: after an infection, inflammation, overfatigue, hormonal changes, or other disorders.

It is important to assess not only the number on the thermometer, but also the person’s general condition. If well-being is normal, and there is no pain, cough, weakness, weight loss, or other symptoms, a single increase does not always indicate illness. The reading may change throughout the day and depend on physical activity, stress, overheating, the phase of the menstrual cycle, or the method of measurement.

Doctors at Oxford Medical explain: subfebrile condition is more often discussed when an elevated temperature recurs or lasts longer than expected after a common cold or overfatigue. In such cases, it is important not to take medication at random, but to pay attention to the duration of the condition, accompanying symptoms, and the circumstances after which the increase in the reading appeared.

Is a temperature of 37 °C normal

The familiar reading of 36.6 °C is an approximate average value, not the only norm for all people. According to National Institutes of Health, the reading may change throughout the day: it is usually lower in the morning and slightly higher closer to the evening. Therefore, a body temperature of 37 °C does not always mean illness.

It is important to consider the method of measurement, time of day, and well-being. Readings may be affected by physical activity, stress, overheating, hot food or drinks, tight clothing, the phase of the menstrual cycle, and a recently experienced infection. If a person feels well and has no other symptoms, a single increase to 37 °C does not necessarily require treatment.

More attention is needed if a temperature of 37 lasts for several days in a row, rises every evening, and is accompanied by weakness, sweating, pain, cough, weight loss, or worsening of the general condition. In such cases, it is better to see a doctor to determine the cause rather than trying to “bring down” the degrees on your own.

Why a temperature of 37 °C persists in adults

A slight increase in adults may have dozens of causes — from recovery after an infection or overfatigue to a chronic inflammatory process. To understand what may cause a temperature of 37, it is important to consider not only the number on the thermometer, but also the duration of the condition, the time of appearance, recent illnesses, surgeries, medication use, and general well-being.

Common causes of subfebrile temperature

The causes of a slight increase in the reading may be temporary or associated with processes that require examination. Most often, subfebrile condition in adults occurs due to:

  • recovery after a viral or bacterial infection;
  • hidden infections, including hepatitis;
  • chronic inflammatory processes in the ENT organs, urinary system, respiratory organs, or digestive tract;
  • overfatigue, lack of sleep, prolonged stress;
  • hormonal changes, in particular disorders of thyroid function;
  • exacerbation of chronic diseases;
  • autoimmune processes, in particular rheumatoid arthritis;
  • recovery after surgery or injury;
  • reaction to certain medications;
  • thermoregulation disorders.

Doctors at Oxford Medical note: if the reading lasts for several days or recurs without an obvious cause, the doctor may order tests of blood, urine, inflammatory markers, and other examinations depending on the complaints. It is impossible to determine the cause independently based only on the number on the thermometer, so it is important to assess the condition comprehensively.

Temperature of 37 °C without symptoms

Such subfebrile condition may appear after a recent infection, physical or emotional overload, a change in sleep schedule, or against the background of individual features of thermoregulation. Sometimes a person has no obvious complaints, but the body is still recovering after a previous illness or reacting to a hidden process.

At the same time, the absence of symptoms does not mean that the cause can be ignored. If the situation recurs every day, continues for more than a week, and night sweating appears, weight loss is observed, weakness occurs, or lymph nodes enlarge, it is worth seeing a doctor. If an infectious process is suspected, a consultation with an infectious disease specialist may be needed.

Why a temperature of 37 °C rises in the evening

The reading naturally changes throughout the day: in the morning it is usually lower, and in the evening it may be slightly higher. This is related to circadian rhythms, physical activity, nutrition, fatigue level, and the work of the thermoregulation system. Therefore, a single increase to 37 °C in the evening is not always a sign of illness.

If a temperature of 37 regularly rises in the evening, it is worth paying attention to the circumstances: whether there is cough, pain, sweating, sleep disturbances, weight changes, or other complaints. In women, hormonal fluctuations may affect thermoregulation, in particular the menopausal period, so it is important to assess not only the thermometer reading, but also the general condition.

Persistent temperature of 37 °C

A constant or almost daily increase in the reading requires more careful attention. A long-term subfebrile temperature may persist after infections, with chronic inflammation, endocrine disorders, oncology, autoimmune diseases, or other conditions that do not always have obvious symptoms at the beginning.

It is especially important to see a doctor if a temperature of 37 lasts for a week and has no clear cause. During the consultation, a family doctor or therapist clarifies when exactly the reading rises, how it is measured, whether there have been recent illnesses, surgeries, weight loss, sweating, pain, cough, or changes in appetite.

Subfebrile temperature after surgery

After surgery, a slight increase may be the body’s reaction to surgical intervention, tissue healing, and postoperative recovery. In the first days, this does not always indicate a complication, especially if the temperature gradually decreases, the general condition is stable, and the postoperative wound looks calm.

Situations should be concerning when the reading increases, lasts for a long time, is accompanied by chills, increasing pain, redness, swelling, discharge from the wound, shortness of breath, or a sharp deterioration in well-being. In such a case, it is necessary to contact the doctor who performed the surgery or an on-duty medical facility, rather than waiting for the condition to pass on its own.

Subfebrile temperature after inflammatory processes

After a previous inflammation, the temperature may remain slightly elevated for some time. This happens after respiratory infections, bronchitis, pneumonia, sinusitis, urinary system infections, and other diseases when the body is gradually recovering. It is important to assess the dynamics: the reading usually gradually decreases, and well-being improves.

If a temperature of 37 persists after pneumonia, this does not always mean a complication, but it requires monitoring. Especially if cough, weakness, shortness of breath, chest pain, or rapid fatigue remain. In such a situation, the doctor can assess the treatment results, prescribe a repeat examination if necessary, and adjust the treatment of pneumonia or recovery recommendations.

Why children have a temperature of 37 °C

Why children have a temperature of 37 °C

A temperature of 37 °C in a child does not always mean the onset of illness. In children, the reading may change more quickly after active games, crying, overheating, tight clothing, hot food, stress, or prolonged stay in a warm room. Sometimes it is enough to let the child rest, remove extra clothing, offer water, and measure the reading again after 20–30 minutes.

It is worth focusing on the child’s behavior: whether they are active, whether they drink normally, and whether there is no lethargy, drowsiness, rash, vomiting, diarrhea, shortness of breath, or complaints of pain. If the child feels well, a single reading of 37 °C usually does not require antipyretic medications.

Subfebrile temperature in a child requires attention if it lasts for several days, rises every evening, appeared after an infection, or is accompanied by cough, sore throat, runny nose, abdominal pain, frequent urination, rash, decreased appetite, or pronounced weakness. In such cases, the child should be shown to a pediatrician to determine the cause and not miss an inflammatory process.

Temperature of 37 °C and accompanying symptoms

Accompanying symptoms help understand in which direction to look for the cause. Body aches, cough, back pain, shortness of breath, weakness, or changes in blood pressure may indicate different conditions, so it is important to assess them together with the duration of the temperature and general well-being.

Body aches and temperature of 37 °C

Body aches and a temperature of 37 most often occur at the beginning of a viral infection, after hypothermia, physical overstrain, or against the background of general exhaustion. A person may experience weakness, drowsiness, muscle discomfort, chills, or increased body sensitivity to usual loads.

If the aches pass within 1–2 days and the reading does not increase, rest, adequate fluid intake, and monitoring of well-being are usually sufficient. If sore throat, runny nose, cough, rash, pronounced weakness, or an increasing reading is added, it is better to see a doctor.

Cough and temperature of 37 °C

Cough against the background of a temperature of 37 °C may appear with a cold, ARVI, bronchitis, exacerbation of chronic respiratory diseases, or during recovery after an infection. It is important to assess the nature of the cough: whether it is dry or wet, whether there is sputum, chest pain, shortness of breath, wheezing, or weakness.

You should see a doctor if the cough lasts more than several days, worsens, interferes with sleep, or is accompanied by shortness of breath, chest pain, purulent or bloody sputum. It is also not worth postponing an examination if the temperature persists after bronchitis or pneumonia.

Back pain and temperature of 37

This may be associated not only with muscle overstrain. Sometimes such a combination occurs with inflammatory processes in the kidneys, urinary tract, pelvic organs, or with exacerbation of chronic diseases. The localization of pain also matters: in the lower back, between the shoulder blades, on one side, or throughout the back.

It is worth seeing a doctor if back pain is accompanied by frequent or painful urination, swelling, nausea, chills, weakness, or worsens with movement. In such cases, you should not warm the back on your own or take antibiotics without a prescription.

High blood pressure and temperature of 37 °C

Elevated blood pressure and a temperature of 37 °C may occur simultaneously against the background of stress, overfatigue, anxiety, pain, lack of sleep, or an acute infection. Temperature itself is not a typical cause of a persistent increase in blood pressure, but poor well-being and an inflammatory process may affect the cardiovascular system.

Doctors at Oxford Medical note: blood pressure should be measured at rest, after 5–10 minutes of rest, and, if necessary, the measurement should be repeated once more. If there is chest pain, shortness of breath, severe headache, visual disturbances, numbness of the limbs, sharp weakness, or blood pressure is significantly elevated and does not decrease, medical help is needed.

What to do when the temperature is 37 °C

What to do when the temperature is 37 °C

When the temperature is low, you should not take medication immediately. First, it is better to assess well-being over time: measure the temperature again after 20–30 minutes at rest, drink enough fluids, avoid overheating, ventilate the room, and watch whether additional symptoms appear. If the condition worsens or the temperature lasts for several days, it is better not to self-medicate.

Can a temperature of 37 °C be lowered

Such a reading usually does not need to be lowered with antipyretic medications. Antipyretics are usually used at higher readings or on a doctor’s recommendation — for example, if there is pronounced discomfort, accompanying diseases, or individual indications. If a subfebrile body temperature lasts for a long time, it is important not only to lower it, but to determine the cause.

Can you go for a walk with a temperature of 37 °C

Usually, walking is allowed if a person feels well and does not have weakness, chills, shortness of breath, pronounced cough, or other symptoms of an acute infection. The walk should be calm, without physical exertion, overheating, or hypothermia.

If there are body aches, severe fatigue, dizziness, cough, runny nose, or suspicion of a contagious infection, it is better to stay at home. In such a case, the body needs rest, and contact with other people may be undesirable.

Can you take a shower or bath with a temperature of 37 °C

Whether you can take a shower with a temperature of 37 depends on your well-being. If there are no chills, severe weakness, or dizziness, a short warm shower is usually allowed. The water should be comfortable — neither hot nor cold, and after the shower it is important to dress according to the weather and avoid hypothermia.

As for whether you can take a bath with a temperature of 37, greater caution is needed here. A hot bath may increase heartbeat, weakness, and overheating, especially if the subfebrile condition developed against the background of an infection. If there is malaise, chills, or poor well-being, it is better to postpone the bath and limit yourself to a hygienic shower.

Can inhalations be done with a temperature of 37 °C

The answer depends on the type of inhalation and the cause of the symptoms. Nebulizer inhalations with medications may be performed only as prescribed by a doctor, especially for children, people with bronchospasm, asthma, or chronic respiratory diseases.

Steam inhalations for cough or runny nose are better not used without a doctor’s recommendation. Hot steam may irritate the mucous membranes, increase swelling, and create a risk of burns, especially in children.

Can you take paracetamol with a temperature of 37 °C

Paracetamol is usually not needed if there is no pronounced pain or other indications. It should not be taken only to “bring down” a low temperature, because the medication does not eliminate the cause of the condition.

Paracetamol has contraindications and dosage restrictions, especially in liver diseases, alcohol consumption, or simultaneous use of other products containing paracetamol. If there are doubts, it is better to agree on medication use with a doctor.

Can you take an antibiotic with a temperature of 37 °C

An antibiotic should not be taken on your own only because of a subfebrile condition. Such an increase may be associated with a viral infection, recovery after illness, stress, inflammatory or non-infectious causes, while antibiotics act only on bacterial infections.

Unauthorized use of antibiotics may lead to adverse reactions, disruption of the microflora, and the development of antibiotic resistance. The decision on antibacterial treatment is made by a doctor after an examination, assessment of symptoms, and, if necessary, test results.

Can you take Fervex with a temperature of 37 °C

Fervex and similar combination products are usually used for temporary relief of cold symptoms, not for treating the cause. With a reading of 37 °C without a runny nose, sore throat, headache, or pronounced discomfort, such a medication is usually not needed.

It is important to consider that combination products may contain paracetamol and other components with their own contraindications. Before taking them, you should carefully read the instructions, not exceed the dosage, and not combine several medications with the same active ingredients.

When to see a doctor

When to see a doctor

It is worth seeing a family doctor or therapist if a temperature of 37 °C lasts for several days without a clear cause, recurs every evening, or is accompanied by worsening well-being. It is especially important not to postpone the consultation if symptoms appear that may indicate an inflammatory, infectious, autoimmune, or other systemic process.

A planned examination is needed if the following symptoms are also present at the same time:

  • weakness, rapid fatigue, drowsiness;
  • night sweating or chills;
  • cough, shortness of breath, chest pain;
  • sore throat, enlarged lymph nodes;
  • abdominal pain, nausea, diarrhea;
  • lower back pain or urinary disorders;
  • rash or joint pain;
  • weight loss without a clear cause;
  • anxiety, sleep disorders, a feeling of constant tension, neurosis;
  • recent surgery, pneumonia, or another inflammatory disease.

First, you can contact a family doctor or therapist. The doctor will clarify complaints, examine the patient, prescribe basic examinations, and, if necessary, refer the patient to a specialist.

Doctors at Oxford Medical recommend not taking antibiotics, antipyretics, or other medications without a prescription if the cause of the temperature is unknown.

A temperature of 37 °C is not always a sign of a dangerous disease, but it should not be ignored if it lasts for a long time, recurs regularly, or is accompanied by other symptoms. In many cases, a slight increase is associated with recovery after infection, overfatigue, stress, or temporary changes in thermoregulation. But sometimes it may be a manifestation of an inflammatory, infectious, endocrine, or autoimmune process.

If the temperature persists for more than several days, weakness, cough, pain, night sweating, weight loss, or other warning symptoms appear, it is better to see a doctor. Timely diagnostics helps determine the cause, avoid self-treatment, and choose the correct course of action.

The information in this article is provided for informational purposes and is not an instruction for self-diagnosis or self-treatment. If symptoms of a disease appear, you should consult a doctor.

Sources:

US National Library of Medicine

National Institutes of Health

Centers for Disease Control and Prevention