Throat Infection: Symptoms and Causes
Know what is throat infection, common symptoms, causes, how to manage and prevent them using medications and home remedies. Learn about when to see a doctor and more.
Written by Dr. Siri Nallapu
Reviewed by Dr. Shaik Abdul Kalam MD (Physician)
Last updated on 12th Aug, 2025
Throat Infection: Symptoms and Causes
A throat infection can be painful and uncomfortable, making it difficult to swallow, speak, or even breathe easily. While most throat infections are mild and resolve on their own, some may require medical attention. Understanding the symptoms and causes can help you take the right steps toward recovery.
What Is a Throat Infection?
A throat infection occurs when harmful bacteria, viruses, or other irritants inflame the tissues in your throat. The most common types include:
- Pharyngitis – Inflammation of the pharynx (back of the throat).
- Tonsillitis – Infection of the tonsils (lymph nodes at the back of the throat).
- Laryngitis – Swelling of the voice box (larynx).
Most throat infections are caused by viruses, but bacterial infections (like strep throat) can also occur.
Consult ENT specialist for Personalised Advice
Common Symptoms of a Throat Infection
The signs of a throat infection can vary depending on the cause, but common symptoms include:
- Sore throat – Pain or scratchiness that worsens when swallowing.
- Red or swollen tonsils – Sometimes with white patches or pus.
- Hoarse voice – Difficulty speaking clearly.
- Swollen lymph nodes – Tender lumps in the neck.
- Fever and chills – Especially in bacterial infections.
- Cough or runny nose – More common in viral infections.
- Headache and body aches – General discomfort.
If you experience severe symptoms like difficulty breathing, high fever (above 101°F), or persistent pain lasting more than a week, consult a doctor immediately.
What Causes a Throat Infection?
Throat infections can be triggered by different factors:
1. Viral Infections (Most Common)
It includes:
- Common cold or flu – Caused by viruses like rhinovirus or influenza.
- Mononucleosis (Mono) – A viral infection causing extreme fatigue and sore throat.
- COVID-19 – Some variants cause throat irritation.
2. Bacterial Infections
It includes:
- Strep throat – Caused by Streptococcus pyogenes, leading to severe pain and fever.
- Diphtheria – A rare but serious bacterial infection (preventable by vaccination).
3. Other Causes
It includes:
- Allergies – Postnasal drip from allergies can irritate the throat.
- Dry air – Breathing dry air (especially in winter) can cause throat dryness.
- Smoking or pollution – Irritants can lead to chronic throat discomfort.
- Acid reflux (GERD) – Stomach acid flowing back into the throat can cause irritation.
How to Manage and Prevent Throat Infections
Most mild throat infections improve within a week with self-care. Here are some helpful tips:
Home Remedies
- Gargle with warm salt water – Reduces swelling and soothes pain.
- Stay hydrated – Drink warm liquids like herbal tea, broth, or honey-lemon water.
- Use a humidifier – Moist air prevents throat dryness.
- Rest your voice – Avoid shouting or excessive talking.
- Lozenges or throat sprays – Provide temporary relief.
Medical Treatment
- Antibiotics – Only for bacterial infections (like strep throat).
- Pain relievers – Over-the-counter medications (ibuprofen, acetaminophen) can help with fever and pain.
- Throat swab test – If strep throat is suspected, a doctor may recommend a test.
Prevention Tips
The preventive tips include:
- Wash hands frequently to avoid infections.
- Avoid close contact with sick individuals.
- Quit smoking and limit exposure to pollution.
- Strengthen immunity with a balanced diet (rich in vitamin C, zinc).
When to See a Doctor?
While most throat infections are harmless, consult a doctor if you experience:
- Severe pain or difficulty swallowing
- High fever (above 101°F)
- Swelling that blocks breathing
- Rash or joint pain (possible scarlet fever or rheumatic fever)
- Symptoms lasting more than a week
Final Thoughts
Throat infections are common but manageable with proper care. Most cases resolve on their own, but knowing when to seek medical help is crucial. By maintaining good hygiene, staying hydrated, and avoiding irritants, you can reduce the risk of throat infections and recover faster.
Consult ENT specialist for Personalised Advice
Consult ENT specialist for Personalised Advice
Dr. Bhethala Sharan Prakash
General Physician/ Internal Medicine Specialist
5 Years • MBBS MD
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Aijaz Muzamil
Ent Specialist
46 Years • MBBS, Ms ENT
Bengaluru
Apollo Clinic, Sarjapur Road, Bengaluru
Dr. Saloni Sinha
Ent Specialist
17 Years • MBBS,MS (ENT) ,FAM, FELLOWSHIP IN RHINOPLASTY, FELLOWSHIP IN LASER AND AESTHETIC MEDICINE, CERTIFICATE COURSE IN FESS (IMMAST)
Delhi
Aishanya Aesthetic Centre, Delhi
Dr. Sushma Patil
Ent Specialist
20 Years • MBBS, DLO (Diploma in Laryngology & otology) ENT
Bengaluru
Apollo Clinic, JP nagar, Bengaluru
Dr. Sourav Banerjee
Ent Specialist
5 Years • MBBS, MS (Otorihnolaryngology)
New Delhi
THE DOCTORS NESST, New Delhi
Consult ENT specialist for Personalised Advice
Dr. Bhethala Sharan Prakash
General Physician/ Internal Medicine Specialist
5 Years • MBBS MD
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Aijaz Muzamil
Ent Specialist
46 Years • MBBS, Ms ENT
Bengaluru
Apollo Clinic, Sarjapur Road, Bengaluru
Dr. Saloni Sinha
Ent Specialist
17 Years • MBBS,MS (ENT) ,FAM, FELLOWSHIP IN RHINOPLASTY, FELLOWSHIP IN LASER AND AESTHETIC MEDICINE, CERTIFICATE COURSE IN FESS (IMMAST)
Delhi
Aishanya Aesthetic Centre, Delhi
Dr. Sushma Patil
Ent Specialist
20 Years • MBBS, DLO (Diploma in Laryngology & otology) ENT
Bengaluru
Apollo Clinic, JP nagar, Bengaluru
Dr. Sourav Banerjee
Ent Specialist
5 Years • MBBS, MS (Otorihnolaryngology)
New Delhi
THE DOCTORS NESST, New Delhi