what is strep throat

What is strep throat?

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While many people use the terms sore throat, tonsillitis, and strep throat interchangeably, there are significant clinical differences between these conditions. Understanding the differences can give patients a better idea of how and when to be concerned and when to seek advice from a physician.

Watch: Sore Throat Causes, Symptoms, Remedies


Strep throat is only one of many possible causes of throat infection and sore throat. While strep throat is most common in children and adolescents, it can affect people of all ages.


What causes sore throat?
Sore throat has many causes. The most common causes of sore throat are infections of the throat and the surrounding structures. Any inflammation or infection of the pharynx, tonsils, esophagus (the food pipe), or larynx (the top opening part of the windpipe) may cause sore throat.


How Strep Throat Spreads

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Anybody can get strep throat, but it's most common in school-age kids and teens. These infections occur most often during the school year when big groups of kids and teens are in close quarters.

The bacteria that cause strep throat (group A streptococcus) tend to hang out in the nose and throat, so normal activities like sneezing, coughing, or shaking hands can easily spread infection from one person to another.

That's why it's so important to teach kids the importance of hand washing — good hygiene can lessen their chances of getting contagious diseases like strep throat.


What are the tonsils and tonsillitis?
The tonsils are red, oval clumps of tissue located at the back and to the sides of the throat. This location allows the tonsils to intercept germs as they enter the body through the nose and throat. They contain infection-fighting cells and antibodies (infection-fighting proteins in the body) that stop the spread of the germs further into the body.

Tonsillitis refers to conditions in which the tonsils become red, sore, and swollen because of inflammation. This is not a specific term, as there are many causes of inflammation of the tonsils. Tonsillitis is a common cause of sore throat.


What are the pharynx and pharyngitis?
The pharynx is the area in the back of the throat shared by the oral cavity and the nasal cavity behind the palate. An infection or inflammation of the pharynx is called pharyngitis. The infectious causes are similar to those causing tonsillitis, which are mainly related to viruses and less commonly to bacterial infection.

Because it is difficult to always distinguish exactly between pharyngitis and tonsillitis, throat infections are commonly referred to as tonsillopharyngitis, which signifies an infection of the tonsils, or pharynx, or both.