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Strep Throat
(Symptoms, Causes, Diagnosis, and Treatment)

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Medical Author:

Siamak T. Nabili, MD, MPH

Siamak T. Nabili, MD, MPH

Dr. Nabili received his undergraduate degree from the University of California, San Diego (UCSD), majoring in chemistry and biochemistry. He then completed his graduate degree at the University of California, Los Angeles (UCLA). His graduate training included a specialized fellowship in public health where his research focused on environmental health and health-care delivery and management.

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Medical Editor:

William C. Shiel Jr., MD, FACP, FACR

William C. Shiel Jr., MD, FACP, FACR

Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

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Medical Editor:

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

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What is strep throat?

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.

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.

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.