Symptoms of a sore throat can vary depending on the cause. Signs and symptoms might include:

• Pain or a scratchy sensation in the throat
• Pain that worsens with swallowing or talking
• Difficulty swallowing
• Sore, swollen glands in your neck or jaw
• Swollen, red tonsils
• White patches or pus on your tonsils
• A hoarse or muffled voice

Infections causing a sore throat might result in other signs and symptoms, including:

• Fever
• Cough
• Runny nose
• Sneezing
• Body aches
• Headache
• Nausea or vomiting

Viruses that cause the common cold and the flu also cause most sore throats. Less often, bacterial infections cause sore throats.

Viral infections

Viral illnesses that cause a sore throat include:

• Common cold
• Flu (influenza)
• Mono (mononucleosis)
• Measles
• Chickenpox
• Croup — a common childhood illness characterized by a harsh, barking cough
• Whooping cough (pertussis)

Bacterial infections

A number of bacterial infections can cause a sore throat. The most common is Streptococcus pyogenes (group A streptococcus) which causes strep throat.

Other causes

Other causes of a sore throat include:

• Allergies. Allergies to pet dander, molds, dust and pollen can cause a sore throat. The problem may be complicated by postnasal drip, which can irritate and inflame the throat.
• Dryness. Dry indoor air can make your throat feel rough and scratchy. Breathing through your mouth — often because of chronic nasal congestion — also can cause a dry, sore throat.
• Irritants. Outdoor air pollution and indoor pollution such as tobacco smoke or chemicals can cause a chronic sore throat. Chewing tobacco, drinking alcohol and eating spicy foods also can irritate your throat.
• Muscle strain. You can strain muscles in your throat by yelling, talking loudly or talking for long periods without rest.
• Gastroesophageal reflux disease (GERD). GERD is a digestive system disorder in which stomach acids back up in the food pipe (esophagus).

Other signs or symptoms may include heartburn, hoarseness, regurgitation of stomach contents and the sensation of a lump in your throat.

• HIV infection. A sore throat and other flu-like symptoms sometimes appear early after someone is infected with HIV.

Also, someone who is HIV-positive might have a chronic or recurring sore throat due to a fungal infection called oral thrush or due to a viral infection called cytomegalovirus (CMV), which can be serious in people with compromised immune systems.

• Tumors. Cancerous tumors of the throat, tongue or voice box (larynx) can cause a sore throat. Other signs or symptoms may include hoarseness, difficulty swallowing, noisy breathing, a lump in the neck, and blood in saliva or phlegm.

Rarely, an infected area of tissue (abscess) in the throat or swelling of the small cartilage "lid" that covers the windpipe (epiglottitis) can cause a sore throat. Both can block the airway, creating a medical emergency.

Although anyone can get a sore throat, some factors make you more susceptible, including:

• Age. Children and teens are most likely to develop sore throats. Children ages 3 to 15 are also more likely to have strep throat, the most common bacterial infection associated with a sore throat.
• Exposure to tobacco smoke. Smoking and secondhand smoke can irritate the throat. The use of tobacco products also increases the risk of cancers of the mouth, throat and voice box.
• Allergies. Seasonal allergies or ongoing allergic reactions to dust, molds or pet dander make developing a sore throat more likely.
• Exposure to chemical irritants. Particles in the air from burning fossil fuels and common household chemicals can cause throat irritation.
• Chronic or frequent sinus infections. Drainage from your nose can irritate your throat or spread infection.
• Close quarters. Viral and bacterial infections spread easily anywhere people gather, whether in child care centers, classrooms, offices or airplanes.
• Weakened immunity. You're more susceptible to infections in general if your resistance is low. Common causes of lowered immunity include HIV, diabetes, treatment with steroids or chemotherapy drugs, stress, fatigue, and poor diet.