Do my eyes itch with a sinus infection?

Usually not. Itchy, watery eyes and an itchy nose or throat are classic allergy signs. Sinus infections cause facial pain, pressure, and thick discharge, not itching.

I have green or yellow mucus. Do I need antibiotics?

Not by itself. Colored mucus is common in ordinary viral colds. Antibiotics are only considered when symptoms last 10 or more days without improving, are severe with a high fever, or worsen after you started feeling better.

Can allergies turn into a sinus infection?

Allergic inflammation can make a sinus infection more likely, but allergies are not an infection and do not respond to antibiotics. If allergy symptoms suddenly worsen with facial pain and fever after 10 days, a secondary sinus infection is possible.

How long is too long for symptoms?

Most viral sinus symptoms improve within 7 to 10 days. Symptoms lasting past 10 days without improvement, or worsening after you started feeling better, are worth a clinician visit. Allergy symptoms can last for weeks as long as you are exposed to the trigger.

What actually helps if it is viral or allergic?

Saline nasal rinses, intranasal steroid sprays, and pain relievers ease both. For allergies, intranasal steroid sprays are the most effective first-line treatment, and antihistamines help itching and sneezing.

Will a doctor scan my sinuses?

Not routinely. Imaging like a CT scan is reserved for repeated infections or suspected complications, not for typical cases.

Primary Care

Seasonal Allergies vs. Sinus Infection: How to Tell Them Apart

Itching means allergies, thick discharge and facial pressure lean sinus infection. A quick guide to telling them apart and knowing when to see a clinician.

Morningside Medical Team

If your nose and eyes itch and you are sneezing with clear, watery drip, that points to seasonal allergies. If you have facial pain or pressure and thick, colored discharge, that leans toward a sinus infection. Allergies do not cause fever and can last for weeks, while most sinus infections are viral and clear up within 7 to 10 days.

Key Takeaways

Itching is the best allergy tell. Itchy nose, eyes, and throat plus watery drip mean allergies. Sinus infections do not itch. (AAFP)
Fever points away from allergies. Allergies never cause fever. A fever, especially over 102°F, suggests an infection. (AAFP)
Duration separates them. Allergy symptoms last as long as you are exposed to the trigger. Viral sinus symptoms usually improve in 7 to 10 days. (AAFP)
Most sinus infections are viral. Only about 2% of viral cases turn bacterial, so antibiotics are rarely needed. (NIH StatPearls)
Colored mucus alone is not a reason for antibiotics. Thick, colored discharge happens in ordinary colds too. (IDSA)

How do I tell allergies from a sinus infection?

The quickest tell is itching. Itchy eyes, nose, and palate, along with bursts of sneezing and clear, watery drip, are hallmark signs of allergies. Sinus infections feel different: facial pain and pressure, a stuffy or full feeling, and thick discharge that may be yellow or green (AAFP).

Two more clues help. Fever is not part of allergies, so a fever suggests a cold or infection instead. And timing matters. Allergies flare when pollen or another trigger is around and stick with you for weeks. A viral sinus infection tends to build, peak, and fade within 7 to 10 days (AAFP).

For a related side-by-side on winter illnesses, see our guide on cold vs. flu symptoms.

Do I need antibiotics for a sinus infection?

Usually not. Viruses cause the large majority of sinus infections, and only about 2% of adult viral cases progress to a bacterial one (NIH StatPearls). That is why antibiotics are rarely the answer.

A clinician considers a bacterial sinus infection when one of three patterns shows up (AAO-HNSF, IDSA):

Symptoms last 10 or more days without improving.
Symptoms are severe from the start, with a fever of 102°F or higher plus thick discharge or facial pain for 3 to 4 days in a row.
Double-sickening: you start to improve, then get worse again within 10 days.

Even when a bacterial infection is confirmed, guidelines often allow watchful waiting with a check-in if you are not better in about a week. When antibiotics are needed, amoxicillin is the usual first choice (AAO-HNSF).

One thing to let go of: colored mucus by itself does not mean bacteria or antibiotics. Thick yellow or green discharge is common in ordinary viral colds. It only matters alongside the duration and severity patterns above (IDSA).

What helps at home?

The good news is that the same simple measures ease both allergies and viral sinus symptoms:

Saline nasal rinses to flush irritation and mucus.
Intranasal steroid sprays, which are the most effective first-line treatment for allergies.
Pain relievers for facial pressure or headache.
Antihistamines for allergy itching and sneezing.

Intranasal steroid sprays help both conditions, and for allergies they outperform other options (AAO-HNSF, AAFP).

You are far from alone in dealing with this. About one in four U.S. adults had a diagnosed seasonal allergy in 2024, and acute sinus infections drive more than 30 million healthcare visits each year (CDC/NCHS, AAFP).

When should I see a clinician?

Seek emergency care right away for any of these, which can signal rare but serious spread from the sinuses (NIH StatPearls, AAFP):

Swelling, redness, or bulging around the eye, or eye pain
Vision changes, double vision, or trouble moving the eye
Severe or worsening headache
Stiff neck, confusion, or a seizure
A high fever that will not come down

Book a regular visit if symptoms last more than 10 days without improving, worsen after you started feeling better, or are severe with a fever of 102°F or higher. Our adult primary care team can sort out what is going on and help you feel better.

If you are not sure which camp your symptoms fall into, that is exactly what we are here for. A short visit can save you weeks of guessing, and we will tailor a plan to you, whether that is allergy relief, comfort care, or a closer look. Reach out and book an appointment whenever you are ready.

This article is for general information and is not a substitute for professional medical advice. Talk to your clinician about your specific situation.