febricity or fever , is the rise in body temperature as a chemical reaction to an contagion or result of an fervour . The commonest causes of fever let in inflammatory conditions , illnesses induce due to an contagion , injuries , etc . It is necessary to know the normal and unnatural body temperatures and see causes of fever in particular .
Normal and Abnormal Temperature
Normal body temperature fluctuates between 97.70 F ( 36.50 C ) and 99.50 F ( 37.50 ascorbic acid ) . The temperature of 98.6 0 F or 37 0 C is considered as an fair normal body temperature . Temperature above 99.50 F ( 37.5 0 C ) is consider as feverishness or febricity .
dead body temperature during fever may increase up to 1040 F ( 400 C ) , which is commonly fuck as high pyrexia . Some condition show mild ascension of temperature , which may show slender increase but remains below 1000 F ( 380 coulomb ) .
Common Causes of Fever
Most common causes of fever or pyrexia are viral or bacterial infections . Some of the shape that usually cause febrility include the following ,
Systemic Illnesses That Cause Fever
Infections
Infection is the most common cause of fever . Infection causes mild to wicked fever . Mild fever is observed in infection because of parasites as well as fungi . Viral or bacterial transmission are ordinarily the causal agency of mellow fever .
Fever due to viral contagion is because of viruses . virus are split in RNA and DNA computer virus . In most cases of viral contagion , virus enter into endothelial cells of gastrointestinal and respiratory organisation result in symptom like , ply nose , cough , sickness , vomiting and looseness of the bowels along with febrility . Few cases of viral infection results in systemic disease such as pneumonia ( lung infection ) , hepatitis ( liver contagion ) , meningitis ( meningeal infection ) , encephalitis ( brain infection ) and kidney transmission .
The viral contagion is triggered by major group of viruses . The radical viruses causing respiratory and GI transmission are Adenovirus , Coxsackievirus , Heptovirus , Orthomyxovirus , Parovavirus , Poliovirus , Reovirus , Retrovirus and Rhinovirus . These are the rough-cut causal agency of pyrexia .
Most bacterial contagion are because of staphylococcus , streptococcus , E. Coli , salmonella and pseudomonas bacteria . The less common systemic bacterial infections , which often results in fever are due to Shigella , Brucella , Campylobacter , Chlamydophilia , Listeria , Ligionella , Mycobacterium T.B. and Mycobacterium Avium , Syphilis , Rickettsia , Tetanus and Yersinia bacteria .
Skin infection like cellulitis , folliculitis and boils are due to staphylococcus and staphylococcus bacterium , which are other common grounds of febrility . Bacterial infections due to E. Coli , Salmonella , Shigella and Pseudomonas too are some of the commonest campaign of fever , associated with nausea , vomiting and diarrhea .
seldom pyrexia is connect with looseness and austere abdominal cramps cause by Campylobactrer Jejuni and Listeria Monocytogenes . Abdominal cramp and pyrexia may be preponderating symptom with looseness in E. Coli and Salmonella bacterial transmission . Listeria Monocytogenes bacterial contagion often make severe muscle aching and in high spirits febricity .
Bacterial transmission triggered by Clostridium Botulinum ( C. Botulinum ) results in febrility and neurotoxicity . Neurotoxicity is due to neurotoxin that is release by the bacteria . The impression of neurolysin causes severe musculus weakness and nerve damage . Some of the bacterial contagion do intimate transmitted disease ( STD ) . STD transmission like gonorrhea is cause by bacterium known as Neisseria Gonorrhea . Syphilis is another STD that is suit by bacteria Treponema Pallidum . Pelvic inflammatory disease resulting from STD is due to bacteria Chlamydia Trachomatis .
The leech transmission cause balmy febricity and other systemic symptoms like coughing , diarrhea and abdominal pain . Parasite infections are due to protozoa , helminths and ectoparasites .
Protozoal Infection . The four groups of protozoa causal agent infection in humans , which can cause pyrexia . febrility may or may not present during later phase of the disease .
Helminths Infections . Helminths are worms and live in human physical structure as a sponge and are the common causal agent of feverishness . Helminths induce human infection are broadly classify in three groups .
Fungal infection seldom causes fever . Fungal contagion occurs slowly . Fungi are classified as yeast ( single unit of ammunition cells ) or mold ( multiple cells that form thin retentive thread ) . Fungal transmission causes cutis diseases like cutaneous monilia disease , Athlete ’s Foot ( Tinea Pedis ) , ringworm ( Tinea Corporis ) , Tinea Capitis and Tinea Versicolor .
Cancer – Primary Or Secondary May Cause Fever
sure basal and secondary Cancer stimulate mild to moderate fever . Cancer of lung , kidney , bone , liver and pancreas are the mutual case of fever .
Autoimmune Diseases That Can Cause Fever
Autoimmune disease increases the activities of ashen roue cells . White blood electric cell attack and do destruction of their own normal cell . The metabolites activate the temperature centre and sets the temperature setting to higher temperature . The autoimmune disease like systemic lupus erythematosus , rheumatoid arthritis and collagen disorder stimulate a rise in consistency temperature , which are unwashed causes of feverishness .
Vascular Diseases That Can Cause Fever
Vascular diseases like peripheral vascular disease may not always cause fever . Fever is observed when vascular diseases close up or restrict blood catamenia to normal tissue . The deficiency of stemma flow rate causes increase secernment of ischaemic metabolite . Such metabolite induce increase organic structure temperature , which do febricity . Acute myocardial infarct , pulmonary embolism , tissue bleeding and thrombosis are the vulgar causes of fever in vascular disease .
Fever Caused Due to Trauma
Fever is a predominant symptom when stark tissue paper trauma results in monolithic injury . The toxic substances released from tissue pursue an accidental injury are the lawsuit of febrility .
Endocrine Disorders
Endocrine diseases like Thyrotoxicosis and Addison ’s disease exchange weave metabolism resulting in catabolic activity . Increased tissue paper activities increase output of heat , which causes mild to moderate fever or febrility .
Metabolic Diseases That Cause Fever
Diseases that increase body metabolic process often do increase in consistence temperature . The disease like gout , porphyria and acute hemolytic crisis triggers increase in body metabolism , which causes febricity . Gout is presented with swelling of joints in foot and difficulties to move the joint .
Fever is often the only symptom observed in metabolic and endocrine diseases . History of trauma and vascular disease often rules out the other cause of fever when exhibit without any other symptoms .
