Sinus Infection or Toothache? How to Tell the Difference

Dr. Shrey Suri · Gurugram · Updated 2026-10-15

If you have been dealing with pain in your upper back teeth and are not sure whether to call a dentist or an ENT, you are not alone. One of the most common reasons patients visit us in Gurugram with a suspected toothache turns out to be a sinus problem instead. The two conditions can feel remarkably similar, but there are clear ways to tell them apart.

Why sinus problems feel like a toothache

Your maxillary sinuses, the air-filled spaces behind your cheekbones, sit directly above the roots of your upper back teeth (the molars and premolars). In many people, the sinus floor and the tooth roots are separated by only a thin layer of bone, sometimes just a millimetre or two.

When the sinus lining becomes inflamed, from a cold, flu, seasonal allergies, or a sinus infection, it fills with fluid and swells. This creates pressure that pushes down on the nerves near the tooth roots, producing a dull, aching pain that feels just like a toothache. Gurugram's dusty air, seasonal pollen, and pollution spikes make allergy-related sinus congestion a fairly common trigger for patients here.

Typical signs it is sinus-related

• Pain affects several upper back teeth on one or both sides, not just one tooth
• Pain gets worse when you bend forward, lie down, or climb stairs
• You also have nasal congestion, a runny or blocked nose, or facial pressure near the cheeks or eyes
• There is a feeling of fullness or heaviness in the face, especially around the cheekbones
• Pain appeared alongside or after cold, flu, or allergy symptoms
• Your sense of smell is reduced or you have postnasal drip

Typical signs it is a true dental problem

• Pain is sharp and clearly traceable to one specific tooth
• Tooth is sensitive to hot, cold, or sweet foods
• Pain gets worse when you bite down or chew on that side
• There is visible decay, a cracked tooth, or an old filling near the painful area
• You notice swelling, redness, or a pimple-like bump on the gum
• Pain is constant and throbbing, and does not change with head position

A quick comparison

Why it matters to get this right

Treating a sinus-related ache as if it were a dental problem can mean unnecessary fillings or even root canal treatment on a perfectly healthy tooth. On the other hand, ignoring genuine dental pain while waiting for a "sinus infection" to clear can allow decay or infection to worsen. Getting an accurate diagnosis early saves time, discomfort, and money.

How a dental check-up helps clarify things

At our Gurugram clinic, we start by examining the painful tooth closely for decay, cracks, gum infection, or sensitivity to percussion (gentle tapping). We may also take an X-ray, which clearly shows whether the pain is coming from the tooth root or whether the maxillary sinus above it looks cloudy or inflamed, a strong clue pointing toward a sinus cause.

If your teeth and gums look healthy on examination and X-ray, but you have nasal congestion or facial pressure, we will usually suggest a visit to an ENT specialist or physician for further evaluation and sinus treatment, which may include decongestants, antihistamines, or antibiotics if a bacterial infection is confirmed.

What you can do while you decide

• Note whether the pain affects one tooth or a whole area of upper back teeth
• Track whether bending forward or lying down makes it worse
• Check for any nasal symptoms like congestion or facial pressure
• Avoid very hot, cold, or hard foods on the affected side until assessed
• Do not start antibiotics on your own; get a proper diagnosis first

If you are still unsure after reading this, the safest first step is usually a dental check-up, since ruling out a tooth problem is quick and straightforward, and we can guide you toward an ENT referral if needed.

Treatment costs mentioned on this page are indicative ranges for the Gurugram region. Your exact cost depends on your case and will be confirmed after a clinical examination at the clinic.