Synonyms Acute sore throat
Viral pharyngitis resulting in visible redness.
  • /færɪnˈtɪs/
Specialty Infectious disease
Symptoms Sore throat, fever, runny nose, cough, headache, hoarse voice[1][2]
Complications Sinusitis, acute otitis media[2]
Duration 3–5 days[2]
Causes Usually viral infection[2]
Diagnostic method Based on symptoms, rapid antigen detection test, throat swab[2]
Differential diagnosis Epiglottitis, thyroiditis, retropharyngeal abscess[2]
Treatment NSAIDs, lidocaine[2][3]
Frequency ~7.5% of people in any 3-month period[4]

Pharyngitis is inflammation of the back of the throat, known as the pharynx.[2] It typically results in a sore throat and fever.[2] Other symptoms may include a runny nose, cough, headache, and a hoarse voice.[1] Symptoms usually last three to five days.[2] Complications can include sinusitis and acute otitis media.[2] Pharyngitis is a type of upper respiratory tract infection.[5]

Most cases are caused by a viral infection.[2] Strep throat, a bacterial infection, is the cause in about 25% of children and 10% of adults.[2] Uncommon causes include other bacteria such as gonorrhea, fungus, irritants such as smoke, allergies, and gastroesophageal reflux disease.[2][3] Specific testing is not recommended in people who have clear symptoms of a viral infection, such as a cold.[2] Otherwise a rapid antigen detection test (RAPD) or throat swab is recommended.[2] Other conditions that can produce similar symptoms include epiglottitis, thyroiditis, retropharyngeal abscess, and occasionally heart disease.[2]

NSAIDs, such as ibuprofen, can be used to help with the pain.[2] Topical lidocaine may also help.[3] Strep throat is typically treated with antibiotics, such as either penicillin or amoxicillin.[2] It is unclear if steroids are useful in acute pharyngitis, other than possibly in severe cases.[6][7]

About 7.5% of people have a sore throat in any three-month period.[4] Two to three episodes in a year is not uncommon.[1] This resulted in 15 million physician visits in the United States in 2007.[3] Pharyngitis is the most common cause of a sore throat.[8] The word comes from the Greek word pharynx meaning "throat" and the suffix -itis meaning "inflammation".[9][10]


Pharyngitis is a type of inflammation, caused by an upper respiratory tract infection. It may be classified as acute or chronic. Acute pharyngitis may be catarrhal, purulent or ulcerative, depending on the causative agent and the immune capacity of the affected individual. Chronic pharyngitis may be catarrhal, hypertrophic or atrophic.

Tonsillitis is a subtype of pharyngitis.[11] If the inflammation includes both the tonsils and other parts of the throat, it may be called pharyngotonsillitis.[12] Another subclassification is nasopharyngitis (the common cold).[13]


The majority of cases are due to an infectious organism acquired from close contact with an infected individual.


These comprise about 40–80% of all infectious cases and can be a feature of many different types of viral infections.[8][14]


A number of different bacteria can infect the human throat. The most common is Group A streptococcus (Streptococcus pyogenes), but others include Streptococcus pneumoniae, Haemophilus influenzae, Bordetella pertussis, Bacillus anthracis, Corynebacterium diphtheriae, Neisseria gonorrhoeae, Chlamydophila pneumoniae, Mycoplasma pneumoniae and Fusobacterium necrophorum.[15]

Streptococcal pharyngitis

Streptococcal pharyngitis or strep throat is caused by group A beta-hemolytic streptococcus (GAS).[16] It is the most common bacterial cause of cases of pharyngitis (15–30%).[15] Common symptoms include fever, sore throat, and large lymph nodes. It is a contagious infection, spread by close contact with an infected individual. A definitive diagnosis is made based on the results of a throat culture. Antibiotics are useful to both prevent complications and speed recovery.[17]

Fusobacterium necrophorum

Fusobacterium necrophorum is a normal inhabitant of the oropharyngeal flora and can occasionally create a peritonsillar abscess. In 1 out of 400 untreated cases, Lemierre's syndrome occurs.[18]


Diphtheria is a potentially life-threatening upper respiratory infection caused by Corynebacterium diphtheriae which has been largely eradicated in developed nations since the introduction of childhood vaccination programs, but is still reported in the Third World and increasingly in some areas in Eastern Europe. Antibiotics are effective in the early stages, but recovery is generally slow.


A few other causes are rare, but possibly fatal, and include parapharyngeal space infections: peritonsillar abscess ("quinsy"), submandibular space infection (Ludwig's angina), and epiglottitis.[19][20][21]


Some cases of pharyngitis are caused by fungal infection such as Candida albicans causing oral thrush.


Pharyngitis may also be caused by mechanical, chemical or thermal irritation, for example cold air or acid reflux. Some medications may produce pharyngitis such as pramipexole and antipsychotics.[22][23]

Diagnostic approach

Modified Centor score
PointsProbability of StrepManagement
1 or less<10%No antibiotic or culture needed
211–17%Antibiotic based on culture or RAPD
4 or 552%Empiric antibiotics

It is hard to differentiate a viral and a bacterial cause of a sore throat based on symptoms alone.[24] Thus often a throat swab is done to rule out a bacterial cause.[25]

The modified Centor criteria may be used to determine the management of people with pharyngitis. Based on 5 clinical criteria, it indicates the probability of a streptococcal infection.[17]

One point is given for each of the criteria:[17]

  • Absence of a cough
  • Swollen and tender cervical lymph nodes
  • Temperature more than 38.0 °C (100.4 °F)
  • Tonsillar exudate or swelling
  • Age less than 15 (a point is subtracted if age is more than 44)

The Infectious Disease Society of America however recommends against empirical treatment and considers antibiotics only appropriate following positive testing.[24] Testing is not needed in children under three as both group A strep and rheumatic fever are rare, except if they have a sibling with the disease.[24]


The majority of time treatment is symptomatic. Specific treatments are effective for bacterial, fungal, and herpes simplex infections.



Gargling salt water is often suggested but evidence looking at its usefulness is lacking.[3] Alternative medicines are promoted and used for the treatment of sore throats.[32] However, they are poorly supported by evidence.[32]


Acute pharyngitis is the most common cause of a sore throat and, together with cough, it is diagnosed in more than 1.9 million people a year in the United States.[8]


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