Pharyngitis (Sore Throat): Causes, Symptoms, Treatment and Prevention

Pharyngitis, commonly known as a sore throat, is the inflammation of the pharynx often caused by viral or bacterial infections. 80% of most cases are caused by virus. However, bacterial, fungi and environmental factors can cause pharyngitis as well. This article provides an in-depth overview of the causes, symptoms, and treatment options for pharyngitis, along with effective prevention strategies to minimize the risk of infection.

What is Pharyngitis

Pharyngitis, commonly known as a sore throat, is the inflammation of the pharynx, the part of the throat located behind the mouth and nasal cavity.

Causes of Pharyngitis

Most episodes of pharyngitis are caused by viruses.

Viral causes include

• Rhinoviruses
• Adenoviruses
• Coxsackieviruses
• Human parainfluenza viruses (HPIV)
• Influenza (flu)
• Coronaviruses
• Mononucleosis (mono)

Bacteria cause include

• Group A streptococcus
• Haemophilus influenzae
• Chlamydia pneumoniae
• Mycoplasma pneumoniae
• Arcanobacterium haemolyticum

Pathophysiology of Pharyngitis

The pathophysiology of pharyngitis involves several key factors:

Infectious Agents: Pharyngitis can be caused by various infectious agents, including viral and bacterial pathogens. Viral pharyngitis is most commonly caused by rhinovirus, adenovirus, influenza virus, or Epstein-Barr virus (causing infectious mononucleosis). Bacterial pharyngitis is primarily caused by Streptococcus pyogenes (Group A streptococcus) bacteria.Transmission: Pharyngitis-causing pathogens are typically transmitted through respiratory droplets from infected individuals via coughing, sneezing, or close contact.Entry and Attachment: Upon exposure to these infectious agents through inhalation or direct contact with contaminated surfaces or secretions, they enter the body via the respiratory tract and attach to specific receptors on the surface of epithelial cells in the pharynx.Inflammatory Response: The presence of these pathogens triggers an immune response characterized by local release of pro-inflammatory cytokines such as interleukins (IL-6), tumor necrosis factor-alpha (TNF-alpha), and interferons (IFNs). These inflammatory mediators activate immune cells causing vasodilation and increased vascular permeability in blood vessels near affected areas leading to tissue edema and redness.Neurogenic Inflammation: Activation of sensory nerve fibers leads to neurogenic inflammation which contributes further redness swelling associated with painPain Receptors Activation: Release inflammatory mediators activate pain receptors present within mucosa leading painful sensation experienced during infectionMucosal Damage: Pathogens can directly damage mucosal lining in the pharynx resulting in ulcerations contributing further symptoms like difficulty swallowingImmune Response: The immune system recognizes the presence of pathogens and mounts an inflammatory response to eliminate them. This involves recruitment of immune cells such as neutrophils, macrophages, and lymphocytes.Tonsillar Hypertrophy: In some cases, recurrent or chronic pharyngitis can lead to hypertrophy (enlargement) of the tonsils due to repeated infection and inflammation.The combination of these pathophysiological mechanisms results in symptoms commonly associated with pharyngitis including sore throat, pain with swallowing, redness and swelling in the throat area.

Signs & Symptoms of Pharyngitis

Symptoms of pharyngitis vary depending on the underlying cause. The incubation period is between two to five days

Symptoms include;

• Sore, dry, or scratchy throat
• Fever
• Red and enlarged tonsils
• Swelling lymph nodes near the front of the neck
• White spots in the throat
• petechiae
• Abdominal pain
• Headache
• Nausea
• Vomiting
• Loss of appetite
• Rash
• Sneezing
• Runny nose
• Cough
• Fatigue
• Chills
• Muscle aches
• General malaise
• Difficulty in swallowing

Diagnostic Investigations & Test

• Rapid antigen test
• Physical Examination
• History taking
• Throat Culture
• Nucleic Acid Test

Pharyngitis Treatment

Treatment is symptomatic

• Antipyretic and pain relievers such as ibuprofen (Advil, Motrin), acetaminophen (Tylenol) or aspirin (in adults only) to relieve throat pain
• Getting plenty of rest
• Drinking plenty of water to prevent dehydration and throat dryness
• Gargling with warm salty water to ease throat pain
• Drinking warm liquids (tea or broth) or cool liquids or eating gelatin desserts or flavored ices to soothe the throat
• Using a cool mist vaporizer to relieve throat dryness

Nursing Management of Pharyngitis

The following are the measures to put in place in the care of patient receiving treatment

• Check and monitor for the patient's signs and symptoms of inadequate oxygenation and signs of hypoxia.
• Demonstrate and teach the patient the proper way of doing deep breathing exercises.
• Evaluate and note the presence of sputum and check for the quality, color, amount, odor, and consistency.
• Advise and instruct the patient to perform oral care every 4 hours.
• Assess and monitor the patients intake and output every hour and check the patients skin turgor and moisture of the patient's mucous membranes.
• Prepare to administer prescribed antibiotics, analgesics, antitussives and decongestants.
• Encourage the client to gargle with warm saline gargles and use throat lozenges.
• Instruct the client that the temperature of saline should be sufficiently high to be effective and should be as hot as the client can tolerate.
• Instruct the client to apply an ice collar to severe sore throats.
• Instruct the client to have a liquid or soft diet.
• Encourage the client to increase fluid intake to 2,000 ml/per day
• Educate the client to avoid eating spicy foods and drinking juices that are acidic.
• Encourage the client to avoid exposure to irritants, smoking, secondhand smoke, and exposure to cold and alcohol.
• Encourage the client to avoid contact with individuals with upper respiratory infections.
• Encourage the client to use a disposable mask when exposed to environmental and occupational pollutants.

Preventions of Pharyngitis

• Maintaining proper hygiene can prevent many cases of pharyngitis.
• Avoid sharing food, drinks, and eating utensils
• Wash your hands often, especially before eating and after coughing or sneezing
• Use alcohol-based hand sanitizers when soap and water aren't available
• Avoid smoking and inhaling secondhand smoke