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What is Fever? | Part 1

November 6, 2019


Approach to “Fever
Intro: Fever, also called Pyrexia, is one of the
most common presenting complaints in medical practice. It is defined as a body temperature that is
above the normal range (for that individual) without any physiological cause to it (e.g
temperature raise due to exercise or menstrual cycle doesn’t count as fever). This is usually above 38o C recorded by thermometer
(in this case, oral and rectal temperature readings are more accurate than axillary temp). The most important thing to keep in mind is
that “fever” in it of itself is not a disease, but rather a symptom that indicates an underlying
disease process. Mechanism of fever:
Body temperature is usually set to its normal range by the hypothalamus (which acts as a
sort of thermostat). When the body suffers from certain pathological
processes (namely “inflammation”) certain chemicals are released by the body (collectively
called pyrogens, e.g of which is interleukin-2). Pyrogens set the thermoregulatory point of
the hypothalamus to a higher temperature, thus resulting in fever. The causes of fever can be divided into the
broad categories of 1) Infections ( which is the most common cause of pyrexia. It can include bacterial, viral, fungal or
parasitic infections), 2) Clots 3) Cancers, 4) Auto Immune diseases, and 5) Miscellaneous
(which can include things like heat stroke, medications, brain lesions and thyroid storm
to name a few). Diagnosing the cause of fever:
We have mentioned 5 categories of diseases that usually result in fever, and each category
consists of a multitude of possible diseases. In order to narrow down our diagnosis, we
need to do a thorough history and examination, and request appropriate lab investigations
where relevant. Fever is usually accompanied by other symptoms
as well which may guide the diagnosis of underlying disease. Important questions to ask in history:
These can be broadly divided into 2 categories, 1) General fever related, 2)Review of systems. Fever specific questions include; the duration
of fever, the timing of the fever (what time of day is it more prominent), the character
(is it remitting or relapsing), Is it accompanied by chills or rigors? Is there night sweating? Is there weight loss? Is there pain anywhere? Review of systems is a systematic approach
to identify accompanying symptoms in other body organs. This is especially important in identifying
a possible focus of infection. Ask relevant questions pertaining to each
organ system and move from head to toe: so for example ask about headache, neck stiffness? eye pain? skin rashes or itching? runny nose, ear pain or discharge? Coughing, sputum, sore throat, pain on swallowing? Is there difficulty breathing or chest pain,
is there any abdominal pain? Any change in bowel habits? Is there any lymph node enlargement? Any burning sensation while urinating? Any discharge from genitals? Any recent injuries? Any muscle or bone pain? Any recent surgery? Your history will be directed further by the
patients’ responses and will probably start moving towards a probable diagnosis. Examine the relevant organ system in thorough
detail. You mainly need to decide which of the 5 categories
does the disease belong to, and which organ system is likely affected. For example, acute fever with complaint of
burning sensation during urination points to an Infection of the urinary tract, whereas
chronic low grade fever with anemia and weight loss might be indicating a hematological cancer.

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31 Comments

  • Reply md sohail April 28, 2017 at 5:30 am

    alhamdulillah may Allah bless u😊😁

  • Reply vaNadia Yo April 28, 2017 at 12:36 pm

    Semoga Allah mudahkan jalan ke syurga… sesungguhnya kami iri dengan amal jariyah ini….

  • Reply The Akhi Designs May 9, 2017 at 3:10 am

    Thank you very much for this video!!! Sooo benefical! Thanks again! πŸ™‚

  • Reply M K June 1, 2017 at 5:57 am

    Masha Allah. Very informative and easy to understand. May Allah bless you guys. πŸ™‚

  • Reply kenza ouamoussa October 9, 2017 at 5:26 pm

    Loved it.. thanks πŸ˜€

  • Reply ABCD January 10, 2018 at 2:23 pm

    Please upload videos more frequently.

  • Reply Howlmoon Color March 26, 2018 at 11:10 pm

    This is why I have and fever and why my throat hurts.

  • Reply Shibbal Farooq April 16, 2018 at 9:35 am

    Thanks broπŸ˜€

  • Reply LordBiker May 4, 2018 at 10:11 am

    Well, is known that the principal pyrogens are IL-1, TNFa, IL-6. But also IL-2 causes fever but by an indirect mechanism rather than by a direct effect on the hypothalamus as a true Endogenous Pyrogen.

  • Reply alesha khawar July 5, 2018 at 11:01 am

    Plz upload more vedio
    Great work

  • Reply fudogchomp September 5, 2018 at 6:06 am

    Wow super great video πŸ˜ƒ

  • Reply Shin Morales October 1, 2018 at 10:22 pm

    Who has a fever while watching
    This

  • Reply dixit kumar January 20, 2019 at 2:21 pm

    very best video

  • Reply Rique February 3, 2019 at 7:11 pm

    I need house.

  • Reply alumnicrabby- Brawlstars February 6, 2019 at 4:18 am

    I chuged down some NY quil

  • Reply alumnicrabby- Brawlstars February 6, 2019 at 4:19 am

    Wasap fever people

  • Reply SRK_ creations February 9, 2019 at 12:49 pm

    Loved it ✌ very helpfull

  • Reply saunak podder March 7, 2019 at 6:06 am

    watching this while having a fever!

  • Reply Prerna Trikha May 12, 2019 at 6:23 am

    Nice video

  • Reply David Yammstien May 16, 2019 at 7:57 pm

    fevers are induced naturaly during excersize. fever is not a symptom it is caused by various ways heat heats up the body l fevers starve the body of water through sweating and cause heatstroke, heat exhaustion and dehydration symptoms. when you heat up your body sweats as bood is boiled at 98 f. and blood is lost through sweating and through evaporation. you can make yourself get heat stroke/exhaustion aka hypothermia symptoms over excersizing. fevers are a sign of high bloodpressure followed by low bp and fainting.

  • Reply David Yammstien May 16, 2019 at 7:59 pm

    the faster your heart beats the hotter your body gets until sweating is induced. fevers accelerate weight loss. cold chills are caused by sweat getting cold inducing hypothermia. pumping friction aka blood rubs against arterie walls heating up blood/water. water is starved from the body during fever and esp when vomiting and diarrea are present.

  • Reply David Yammstien May 16, 2019 at 8:01 pm

    medical mistakes are the number one cause of death more than natural disasters, vehicle disasters combined. the higher or longer lasting the fever the worse the symptoms the more weight is lost. people thrive in mild climate temps of around 70f. that allow a normal bodytemp range. its healthy to level your bodyweight unless you are obese/overweight or gain weight to gain muscle. i suggest you gauge your bodytemp during extensive cardio excersize your in for a suprise. your heart rate increases during excersize as well as your bodytemp.

  • Reply David Yammstien May 17, 2019 at 2:52 am

    your heartrate and enivornment regulate bodyheat. no heartrate no bodyheat. water boils at 101 degrees f. a fevers start.

  • Reply bocii Hesham June 10, 2019 at 2:08 am

    omg amazing info and animation 😍 watching while studying for my community pharmacy exam πŸ™ƒ

  • Reply Bridget the Swagg Master June 10, 2019 at 2:54 am

    I went to the doctor had a fever of 103 ,he gave me some meds then it jump to 107.he said i had no other systoms besides being tired. He had no idea what i had.does anyone one know what causedthe fever and why it jumped?

  • Reply Martina Flow July 17, 2019 at 9:27 pm

    I got even more fever of listing to this while having a high fever

  • Reply Musha III July 29, 2019 at 3:28 am

    100.4 what's y'alls?

  • Reply Kpop Gacha μ‘΄κ²½ August 4, 2019 at 5:28 am

    What is fever?
    uH how I got here? I was searching for Gfriend-Fever live oopsβ€”

  • Reply shunxin yang August 18, 2019 at 8:15 am

    me:has fever
    also me:whats fever

  • Reply William Hazelwood August 19, 2019 at 5:11 pm

    Eye pain? That's a thing?

  • Reply PSJish August 31, 2019 at 6:05 am

    Med student liked the video

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