Why Do Your Teeth Hurt When You Are Sick? When to See a Dentist

A stuffy nose, a scratchy throat, and now your teeth are throbbing too? That last part catches people off guard every time. It’s not a cavity, though. 

Tooth pain during a cold or flu almost always comes from sinus pressure, inflammation, or teeth that are just more sensitive while your body fights off the illness.

The ache typically fades once the sickness does.

At Palm Valley Pediatric Dentistry & Orthodontics, we help patients figure out exactly what’s behind their tooth pain, whether it’s sinus-related or needs actual dental care. 

Key Takeaways

Why Do Your Teeth Hurt When You Are Sick?

When you get sick, your body ramps up inflammation to fight off the infection. 

That inflammation doesn’t stay neatly contained. It can spread to the tissues around your sinuses, which sit just above your upper back teeth. 

As the sinus lining swells, it presses down on the nerves connected to those teeth, and your brain reads that pressure as tooth pain.

Why Upper Teeth Often Hurt More Than Lower Teeth?

Your upper molars and premolars sit closest to your sinus cavities. In some people, the roots of these teeth extend right up near the sinus floor, sometimes with only a thin layer of bone separating them. 

That’s why sinus-related tooth pain almost always shows up on top and rarely bothers the lower jaw.

Is Tooth Pain During a Cold or Flu Normal?

Yes, it happens more often than people realize. According to the Centers for Disease Control & Prevention, Sinus pressure builds fast during a cold or flu, and teeth are surprisingly sensitive to that kind of pressure. 

Most of the time, the pain fades on its own as your congestion clears. If it sticks around well after you have recovered, that’s usually a sign that something else is going on.

Common Causes of Tooth Pain When You Are Sick

When your body is busy fighting off an illness, several factors can put pressure on your teeth at the same time. 

1- Sinus Infection and Sinus Pressure

A sinus infection, or sinusitis, causes the tissue lining your sinuses to swell and fill with fluid. 

That added pressure pushes on the roots of your upper teeth and can make them ache, throb, or feel tender when you bite down.

2- The Common Cold

Even a regular cold can trigger enough congestion to irritate your sinuses. 

You may not have a full infection, but the swelling and mucus buildup can still put pressure on the nerves near your upper teeth.

3- Influenza (Flu)

The flu often hits the body harder than a cold, and that includes your sinuses. 

Body aches, fever, and inflammation can all contribute to sore teeth, especially if you are also dealing with congestion.

4- COVID-19 and Tooth Pain

Some people with COVID-19 report tooth pain or jaw discomfort when sinus congestion or nasal symptoms are present. 

Dry mouth from breathing through the mouth while congested can also add to the discomfort.

5- Teeth Grinding While Sick

Fever, body aches, and poor sleep can lead to more clenching and grinding at night, even if it’s not something you normally do. That extra pressure on your jaw and teeth can leave them feeling sore the next morning.

6- Dehydration and Dry Mouth

When you are sick, it’s easy to drink less water than usual. 

Fever, mouth breathing, and certain medications can dry out your mouth, reducing the saliva that protects your teeth and gums. 

Less saliva means more nerve endings exposed and greater sensitivity.

7- An Underlying Dental Problem

Sometimes illness simply uncovers a problem that was already there. 

A tooth cavity, a cracked tooth, or an infection near the root can flare up when your immune system is already busy, making pain that was mild before suddenly much more noticeable.

Tooth Pain vs. Sinus Pain: How to Tell the Difference

Sinus pressure and a genuine dental problem can feel a lot alike, but they don’t behave the same way. 

Signs It May Be Sinus-Related

Sinus tooth pain usually affects several upper back teeth at once rather than just one. 

It tends to get worse when you bend forward, lie down, or blow your nose, and it often comes along with facial pressure, a stuffy nose, or a headache.

Signs It May Be a Dental Problem

A dental issue usually points to one specific tooth. 

The pain may be sharp, throbbing, or triggered by hot, cold, or sweet foods. Swelling in the gums, a bad taste in your mouth, or sensitivity to biting pressure are also signs the problem is coming from the tooth itself, not your sinuses.

When Both Conditions Can Occur Together

It’s possible to have a sinus infection and a dental problem at the same time, and that overlap can make things confusing. 

If your pain doesn’t improve once your congestion clears up, or if it feels worse than typical sinus pressure, it’s worth getting it checked rather than guessing.

Symptom	Sinus Tooth Pain	Dental Tooth Pain
Location	Multiple upper back teeth	Usually one specific tooth
Trigger	Bending forward, lying down, congestion	Hot, cold, sweet foods, or biting
Pain Pattern	Dull, widespread pressure	Sharp, throbbing, or constant
Swelling	Facial or sinus pressure, no gum swelling	Gum or facial swelling near the tooth
Best Treatment	Treating the sinus infection or congestion	Dental evaluation and treatment

How to Relieve Tooth Pain When You Are Sick?

Most of these remedies focus on calming sinus pressure rather than treating the teeth themselves, and that’s exactly the point. 

1- Treat the Underlying Illness

Since sinus pressure is usually the real culprit, clearing up the cold, flu, or sinus infection is the most effective way to get rid of the tooth pain that comes with it. 

As the swelling in your sinuses goes down, the pressure on your tooth roots eases too, so the ache tends to disappear right along with your other symptoms.

2- Stay Hydrated

Water does more work here than people expect. It thins mucus so your sinuses can drain instead of getting backed up, and it keeps your saliva production steady, which protects your teeth and gums while you are sick. 

Being dehydrated on top of being congested tends to make tooth sensitivity worse, not better.

3- Use Warm Saltwater Rinses

Swishing with warm saltwater a few times a day can calm down irritated gums and reduce inflammation in your mouth. 

It won’t fix the sinus pressure itself, but it takes the edge off aching teeth and gives you some quick, short-term comfort between other remedies.

4- Take Over-the-Counter Pain Relievers

Medications like ibuprofen or acetaminophen work on two fronts at once. 

They dial down the inflammation that’s putting pressure on your teeth, and they dull the pain signal itself, so you get relief while your body does the actual work of fighting off the illness.

5- Use a Humidifier or Saline Nasal Spray

Dry, congested sinuses hold onto pressure longer. 

A humidifier keeps the air moist enough to loosen things up, and a saline spray directly rinses your nasal passages. It helps mucus drain rather than build up around your sinuses and press on your upper teeth.

6- Maintain Good Oral Hygiene

It’s easy to let brushing slide when you feel terrible, but skipping it creates a second problem on top of the first. 

Bacteria don’t take a break just because you are sick, and letting them build up can turn simple sinus-related discomfort into an actual dental issue you didn’t have before.

When Should You See a Dentist?

Most illness-related tooth pain fades on its own, but a few warning signs mean it’s time to stop waiting and book an appointment instead.

Why Choose PVPD for Tooth Pain Evaluation?

Tooth pain that outlasts a cold or flu is your body’s way of telling you something more is going on. 

At Palm Valley Pediatric Dentistry & Orthodontics, we perform a thorough exam using advanced digital imaging to determine whether it’s sinus pressure or a dental issue, then build a treatment plan around your child’s specific needs. 

Don’t wait for it to get worse. Schedule a tooth pain evaluation with us in Scottsdale today.