Could pain swallowing on one side be throat cancer or an abscess?

Pain when swallowing on one side can feel alarming. In most cases, it’s not cancer. More often, it’s something treatable like an infection or muscle strain. Still, it’s important to know when to watch and when to get help. This guide covers common causes, how to tell them apart, and when to speak to a doctor.

What Causes Pain When Swallowing on One Side?
Pain on one side of your throat (also called unilateral odynophagia) can come from several sources:

• Local infections

• Tonsillitis or pharyngitis: Bacterial or viral germs infect your tonsils or throat lining. You may see redness, swelling, white patches or feel a fever.
• Peritonsillar abscess: A collection of pus beside the tonsil. It causes severe, throbbing pain on one side, muffled voice, drooling and difficulty opening your mouth.

• Injuries or irritation

• Strained muscles: Overusing your voice (yelling, singing) or repetitive throat clearing can strain throat muscles.
• Foreign body or chemical burn: A small object, pin, bone fragment or harsh cleaner can scratch or burn part of the throat.

• Ear-related issues

• Referred pain: Ear infections, TMJ (jaw joint) problems or dental issues may make you feel throat pain on one side, even if the throat itself looks normal.

• Acid reflux

• Laryngopharyngeal reflux (LPR): Stomach acid rises into your throat, causing irritation and pain, often worse on one side. You might notice hoarseness or a chronic cough.

• Rare causes

• Throat (pharyngeal) cancer: Uncommon, but possible—especially if you have risk factors like smoking, heavy alcohol use or HPV infection.
• Other tumors or cysts: Benign growths can press on throat structures and cause pain.

Signs and Symptoms of a Peritonsillar Abscess
A peritonsillar abscess is one of the most painful causes of one-sided throat pain. Key features include:

• Intense, constant pain on one side
• Difficulty opening your mouth fully (trismus)
• Muffled or “hot potato” voice
• Swollen, red area beside the tonsil with a bulge
• Fever, chills or general malaise
• Drooling or trouble swallowing saliva

If you suspect a peritonsillar abscess, seek medical care promptly. It often requires drainage and antibiotics. Left untreated, it can spread into deeper neck tissues.

Could It Be Throat Cancer?
Throat cancer is a less common cause of pain when swallowing on one side. Still, it’s important to recognize warning signs, especially if you have risk factors:

Risk factors
• Long-term tobacco or heavy alcohol use
• Human papillomavirus (HPV) infection
• Poor oral hygiene or certain dietary deficiencies
• Previous head and neck radiation therapy

Possible warning signs
• Persistent sore throat on one side, lasting more than 2–3 weeks
• A lump or thickening in the throat or neck
• Unexplained weight loss
• Ear pain on the same side without an ear infection
• Hoarseness or change in voice
• Difficulty opening your mouth

Throat cancer often doesn’t hurt in early stages. Pain may develop as the tumor grows. If you tick multiple risk boxes or have symptoms that last, get evaluated.

Other Causes to Consider
• Tonsillar lymphoma or other lymph node enlargement
• Eosinophilic esophagitis: An allergic inflammation of the esophagus, causing pain and difficulty swallowing.
• Dental problems: Abscessed tooth or impacted wisdom tooth can radiate pain to the throat.
• Vertebral issues: Arthritis or injury in cervical spine can cause referred pain when swallowing.

When to Seek Medical Help
Most mild sore throats resolve in a few days. But certain “red flags” mean you should see a healthcare provider:

Immediate attention (go to ER or call 911 if you have):
• Severe difficulty breathing or breathing noises
• Inability to swallow any liquids
• Drooling or pooling of saliva
• Rapidly spreading swelling in your neck
• High fever (over 101.3°F/38.5°C) with rigors

Prompt evaluation (schedule same-day or next-day doctor visit if you have):
• Pain lasting more than 1–2 weeks
• A lump in the throat or neck that won’t go away
• Ear pain without an ear infection
• Unexplained weight loss of more than 10 pounds in a month
• Voice changes lasting over two weeks

Self-Care Tips for Mild Cases
If your pain is mild and you have no red flags, you may try home remedies for a few days:

• Warm saltwater gargles (½ teaspoon salt in 8 ounces of water)
• Throat lozenges or over-the-counter pain relievers (acetaminophen, ibuprofen)
• Staying hydrated with warm broths, teas with honey, or ice chips
• Humidifying your room to keep your throat moist
• Eating soft foods (soups, mashed potatoes, yogurt, applesauce)

Watch for worsening symptoms. If you don’t improve within 48–72 hours, call your doctor.

Getting a Professional Opinion
Not sure what’s behind your throat pain? You might consider doing a free, online symptom check, using the doctor approved Ubie Symptom Checker. It guides you through questions about your symptoms and suggests possible causes. It’s not a substitute for real medical care, but it can help you decide if you need to see a provider.

Diagnostic Steps Your Doctor May Take
To find out what’s causing pain when swallowing on one side, your healthcare provider may:
• Take a detailed history and do a physical exam, including looking at your throat and feeling your neck
• Order blood tests to look for signs of infection or inflammation
• Swab your throat for strep or other bacterial cultures
• Use imaging (ultrasound, CT scan or MRI) to check for abscesses, tumors or gland swelling
• Refer you to an ENT specialist for a laryngoscopy (a small camera passed into your throat)

Treatment Options
Treatment depends on the underlying cause:

• Bacterial infections: Antibiotics
• Viral infections: Rest, fluids and over-the-counter relief (antibiotics won’t help)
• Peritonsillar abscess: Medical drainage plus antibiotics
• Reflux-related pain: Acid-suppressing medications, dietary changes, elevating the head of your bed
• Cancer or tumors: Surgery, radiation, chemotherapy or a combination, guided by an oncology team
• Dental or jaw issues: Dental treatment, mouth guards or referral to a dentist/orthodontist

When to Talk to a Specialist
You may be referred to an ear, nose and throat (ENT) doctor if:
• Your symptoms persist despite initial treatment
• You have recurrent abscesses or infections
• There’s a suspicious lump or persistent voice change
• Advanced imaging or biopsy is needed

Final Thoughts
Pain when swallowing on one side is usually due to infections or minor injuries—and often clears up with basic care. However, if you have severe pain, difficulty breathing, swallowing or talking, high fever or any lump in your neck, don’t wait. Early evaluation can rule out life-threatening conditions like a spreading abscess or throat cancer.

Always trust your instincts. If something feels serious or you’re not improving, speak to a doctor right away.