Can a Sinus Infection Cause Jaw Pain?

Yes — a sinus infection (sinusitis) is a surprisingly common cause of upper-jaw and toothache-like pain. The maxillary sinuses sit just above your upper molars and premolars, and when they fill with fluid and inflammation, the pressure is felt directly in the jaw.

The Anatomy: Why Sinuses & Jaw Are Linked

The maxillary sinuses are air-filled cavities located inside the cheekbones, directly above the roots of the upper molars and premolars. In many people, the bone separating the sinus floor from the tooth roots is paper-thin — sometimes just a millimetre or two. They share the same nerve supply (the infraorbital and posterior superior alveolar nerves), so pain originating in the sinus cavity is often felt as tooth or jaw pain.

Because of this intimate anatomical relationship, dental infections can spread upward into the sinus (causing odontogenic sinusitis), and sinus infections can radiate downward into the teeth and jaw. For a deeper look at the wider topic of jaw pain on one side — including other causes — read our dedicated guide.

How Sinusitis Causes Jaw Pain

When the lining of the maxillary sinus becomes inflamed and swollen, the sinus cannot drain properly. Fluid accumulates, pressure builds, and the inflammation irritates the nerves that run along the floor of the sinus. The brain, which doesn't always know exactly where the signal is coming from, often interprets this as tooth or jaw pain — a phenomenon called referred pain.

Several mechanisms drive this:

• Direct pressure on the tooth roots through the thin sinus floor
• Inflammatory mediators (cytokines, prostaglandins) that sensitise nearby nerves
• Shared nerve pathways that confuse the brain's pain map
• Postnasal drip that irritates the throat and jaw muscles

Sinus-related jaw pain is most often felt in the upper back teeth and the upper jaw, but it can radiate to the lower jaw as well. If you're also dealing with facial swelling or pressure, see the full list of jaw disease symptoms to rule out other causes.

Symptoms to Watch For

Sinusitis-related jaw pain usually comes with other sinus symptoms. Look for:

• Pressure or fullness under the eyes and in the cheeks
• Nasal congestion or coloured nasal discharge
• Reduced sense of smell
• Headache, especially when bending forward
• Pain in multiple upper back teeth (rather than one specific tooth)
• Pain that worsens with sudden head movements or lying down
• Fatigue, low-grade fever, and general malaise
• Ear fullness or ear-related discomfort

Symptoms lasting less than 4 weeks are acute sinusitis. Beyond 12 weeks, it becomes chronic sinusitis and may need specialist evaluation.

Sinus Pain vs. Dental Pain

Telling sinus pain apart from a dental problem can be tricky. The table below summarises the key differences:

• Number of teeth affected: sinus pain usually affects several upper back teeth; dental pain is typically localised to one tooth
• Response to hot/cold: sinus pain is unaffected; a sensitive tooth will respond
• Response to biting: sinus pain does not worsen with biting; a cracked tooth or abscess will
• Associated symptoms: sinus pain comes with nasal congestion and facial pressure; dental pain may have gum swelling or a visible cavity
• Pain triggers: sinus pain worsens with head movement; dental pain often worsens at night

When in doubt, see both a dentist and a maxillofacial specialist. At Gnathos Facial Surgery, we work closely with endodontists and ENT surgeons to pinpoint the source of facial pain quickly.

Treatment & When to See a Specialist

Most acute sinus infections resolve with conservative treatment:

• Saline nasal irrigation (neti pot or rinse bottle)
• Nasal corticosteroid sprays (fluticasone, mometasone)
• Decongestants (short-term use only)
• Pain relief with paracetamol or ibuprofen
• Antibiotics (only for confirmed bacterial sinusitis)

See a specialist promptly if you have:

• Pain that lasts more than 10 days without improvement
• High fever, severe headache, or vision changes
• Swelling of the cheek or around the eye
• Recurrent sinus infections (more than 3–4 per year)
• Suspected dental origin (odontogenic sinusitis) — this often needs both ENT and dental treatment

For persistent or recurrent cases, a CBCT scan of the sinuses and jaw gives a clear picture. If a tooth is the source, root canal infections and jaw symptoms may need to be addressed together.

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