Medical disclaimer: This page is general health information for education only. It is not medical advice and is not a substitute for diagnosis or treatment by a qualified health professional. It has not been reviewed by a clinician. In an emergency, call 911 or your local emergency number.
A cold and a sinus infection can feel almost the same in the first few days. Both can bring a stuffy nose, a sore throat and a cough. The clearest differences are how long symptoms last, how they change over time, and whether your face hurts. This page walks you through those differences so you know what to watch and what to ask. It does not diagnose you. Only a clinician who examines you can decide what you have.
Sinus infection vs. cold: the short answer
A cold usually improves within a week, while a sinus infection often lasts longer and brings facial pain or pressure.
The table compares the two using CDC and MedlinePlus descriptions. A cold is a viral infection of the upper respiratory tract, according to the CDC overview of the common cold. A sinus infection happens when fluid builds up in the sinuses and lets germs grow, per the CDC sinus infection basics page.
| Feature | Common cold | Sinus infection (sinusitis) |
|---|---|---|
| Cause | More than 200 respiratory viruses. Rhinoviruses are the most frequent cause. | Fluid buildup in the sinuses lets germs grow. Viruses cause most cases. Bacteria cause some. |
| Typical length | Usually less than a week. Symptoms usually peak within 2 to 3 days. | Acute sinusitis lasts 4 weeks or less. Chronic sinusitis lasts longer than 3 months. |
| Main symptoms | Runny nose, nasal congestion, sneezing, sore throat, cough, headache, mild body aches | Runny or stuffy nose, facial pain or pressure, headache, post-nasal drip, sore throat, cough, bad breath |
| Fever | Usually low grade in older children and adults | Fever longer than 3 to 4 days is a reason to see a provider |
| Antibiotics | Do not work against the viruses that cause colds | Not needed for many sinus infections. A clinician decides. |
Symptoms of the two conditions overlap a great deal. The CDC says a healthcare provider can decide if you need an antibiotic. For the difference between a cold and the flu, see our separate guide to telling a cold from the flu. It is one of several pages in our library of health conditions.
What a sinus infection is, and how it differs from a cold
A sinus infection, also called sinusitis, is swelling of the tissue lining the sinuses, the air-filled spaces in your skull.
- The sinuses sit behind the forehead, nasal bones, cheeks and eyes.
- Sinusitis can start when sinus openings become blocked or too much mucus builds up.
- Colds and allergies can cause extra mucus or swelling that blocks the sinus openings.
- A deviated septum, a nasal bone spur or nasal polyps can also block the sinuses.
- Viruses cause most sinus infections, but bacteria can cause some.
These points come from the MedlinePlus sinusitis article. CDC guidance for clinicians states that 90 to 98% of rhinosinusitis cases are viral. Rhinosinusitis is the clinical term used in its outpatient care guidance for adults.
A cold is different. It is a viral infection of the upper respiratory tract. A cold can lead to a sinus infection, and the CDC lists sinus infections as a possible cold complication. The CDC also lists a previous cold and seasonal allergies as sinus infection risk factors. MedlinePlus lists allergic rhinitis as a sinusitis risk factor. Learn more about allergic rhinitis, or hay fever.
This section covers acute and chronic sinusitis in general terms. It does not cover fungal sinus infections or sinus problems caused by structural conditions, which specialists evaluate.
How long a cold and a sinus infection usually last
Colds usually last less than a week. A sinus infection lasting more than 10 days without improvement needs a clinician’s attention.
- Cold symptoms usually peak within 2 to 3 days of infection.
- Most cold symptoms go away within a week in most cases.
- Adult sinusitis symptoms often follow a cold that does not improve or worsens after 7 to 10 days.
- Acute sinusitis lasts 4 weeks or less.
- Subacute sinusitis lasts from 1 to 3 months.
- Chronic sinusitis lasts longer than 3 months, with milder symptoms that persist.
The cold timeline comes from the CDC and the MedlinePlus common cold article. The sinusitis types come from MedlinePlus.
CDC guidance for clinicians describes three patterns, mostly based on timing, that suggest bacterial sinusitis:
- Symptoms that last more than 10 days without improvement.
- Severe symptoms for more than 3 to 4 days, such as fever of 102°F or higher and pus-like nasal discharge or facial pain.
- Symptoms that improve and then worsen again, with new fever, cough or nasal discharge.
These patterns guide clinicians. They are not a self-diagnosis checklist.
Symptoms that point to a sinus infection
Facial pain or pressure, pain behind the eyes, and symptoms that outlast a normal cold point toward a sinus infection.
MedlinePlus lists these symptoms of acute sinusitis in adults:
- Bad breath or loss of smell
- Cough, often worse at night
- Fatigue and a general feeling of being ill
- Fever
- Headache
- Pressure-like pain, pain behind the eyes, toothache or tenderness of the face
- Nasal stuffiness and discharge
- Sore throat and postnasal drip
The most common cold symptoms are nasal congestion, runny nose, scratchy throat and sneezing, according to MedlinePlus. Adults with colds generally have a low fever or no fever.
No single symptom proves a sinus infection. Allergies and other conditions can cause similar symptoms, and this list does not rule them out.
When to see a clinician
See a healthcare provider for severe facial pain or headache, symptoms lasting more than 10 days, or symptoms that worsen after improving.
The CDC advises seeing a healthcare provider if you have:
- Severe symptoms, such as severe headache or facial pain
- Symptoms that get worse after improving
- Symptoms lasting more than 10 days without getting better
- Fever longer than 3 to 4 days
- Multiple sinus infections in the past year
MedlinePlus adds any change in your vision during a sinus infection. It also lists a severe headache that over-the-counter pain medicine does not relieve. For a cold, the CDC cold care page lists trouble breathing or fast breathing and dehydration as reasons to seek care. It also lists chronic medical conditions that get worse.
These lists are not complete. The CDC says to see a healthcare provider for any symptom that is severe or concerning.
Why antibiotics often are not needed
Most sinus infections get better on their own without antibiotics, and antibiotics do not work against the viruses that cause colds.
The CDC states that you do not need antibiotics for many sinus infections. It also says antibiotics do not work against viruses and will not help you feel better with a cold. Unneeded antibiotics can cause side effects, from a rash to more serious health problems, per the CDC.
For uncomplicated sinus infections, clinicians may suggest watchful waiting or a delayed antibiotic prescription. Watchful waiting means checking how symptoms change before deciding on antibiotics. CDC guidance for clinicians encourages this approach when reliable follow-up is available. The CDC notes that sinus x-rays are not routinely recommended. A clinician usually decides by asking about your symptoms and examining you.
This section does not tell you whether you personally need an antibiotic. That decision belongs to a clinician who knows your history.
Questions to bring to your appointment
Bringing a few questions helps you and your clinician decide what your symptoms mean and what to watch next.
- Do my symptoms look more like a cold, a sinus infection or allergies?
- Does the timing of my symptoms suggest a viral or bacterial infection?
- Is watchful waiting a reasonable option for me, and for how long?
- Which changes in my symptoms should prompt me to call you back?
- If my sinus infections keep coming back, what could be causing them?
- Would a referral to an ear, nose and throat specialist help?
Write down when your symptoms started and how they have changed. Our guide on how to prepare for a medical appointment can help. These questions are a starting point and do not cover every situation.
Sources & further reading
Sources consulted September 2026. This is a drafting date, not a medical review date.