Upper respiratory infection (URI) symptoms center on the nose and throat: runny nose, nasal congestion, sneezing, sore throat, and cough. Most people also experience a headache, mild body aches, and low-grade fever. These symptoms typically peak around days 2 to 3 after they first appear and start improving by day 5, with full resolution within 7 to 14 days.
The Core Symptoms
A URI affects anything above the lungs: your nasal passages, sinuses, throat, and voice box. The most common symptoms are:
- Runny nose and nasal congestion
- Sneezing
- Sore throat
- Cough
- Headache
- Mild body aches
- Low-grade fever
Fever is less common in adults than many people assume. In a study of adults with confirmed viral respiratory infections, only about 23% actually had a documented fever. Children are more likely to develop one, and their fevers tend to run higher. For adults, a URI more often feels like a head full of pressure and a scratchy throat than a feverish illness.
How Symptoms Progress Day by Day
The first day or two usually starts with a tickle in the throat or a feeling of dryness. By days 2 and 3, you’re in the thick of it: congestion is at its worst, your nose is running constantly, and the sore throat may peak. Around day 5, most symptoms begin easing noticeably. The full illness typically resolves somewhere between 7 and 14 days.
Cough is often the last symptom to leave. Even after congestion clears and your energy returns, a lingering cough can persist for 3 to 8 weeks. This post-viral cough happens because the infection temporarily irritates and inflames your airways, and that inflammation takes longer to settle down than the infection itself. It’s annoying but generally resolves on its own.
Symptoms Vary by Location
“URI” is a broad term. Where the infection concentrates in your upper airway changes what you feel most.
When the throat is the main site (pharyngitis), the dominant symptom is a sore throat, sometimes severe enough to make swallowing painful. You may notice redness in the back of your throat, swollen tonsils, or tender lymph nodes along the sides of your neck. If the infection involves your voice box (laryngitis), hoarseness or voice loss becomes the standout feature.
When the sinuses are most involved, you’ll feel facial pressure or pain, especially around your cheeks and forehead. Nasal discharge may turn thick and discolored. A reduced sense of smell is common. If sinus symptoms worsen after initially improving, or you develop pain on one side of your face, that pattern suggests a possible bacterial sinus infection layered on top of the original viral URI.
When the infection settles into the bronchial tubes (acute bronchitis), cough dominates the picture. The cough may produce mucus and can be accompanied by mild wheezing. Discolored mucus by itself doesn’t necessarily mean you have a bacterial infection. It’s a sign of inflammation, which happens with viral and bacterial causes alike.
URI Symptoms in Babies and Young Children
Infants and toddlers get the same basic symptoms as adults, but they show them differently. A baby can’t tell you their throat hurts, so instead you’ll see fussiness, poor feeding, and lethargy. Fever is more common and often more prominent in young children than in adults.
Ear infections are a frequent complication in this age group. Signs include tugging at the ears, increased crying (especially when lying down), and tenderness around the ear. Some children also develop mild eye redness or a slight rash alongside their cold symptoms. Most respiratory infections in early childhood stay confined to the upper airways, but the younger the child, the more closely you should watch for any signs of breathing difficulty.
Viral vs. Bacterial: Why Symptoms Look the Same
The vast majority of URIs are caused by viruses. Symptoms overlap so heavily between viral and bacterial infections that even clinicians can’t reliably tell them apart based on symptoms alone. Cough, fever, and fatigue show up regardless of the cause. This is the main reason antibiotics aren’t prescribed for most URIs: without lab testing, there’s no way to confirm a bacterial cause, and antibiotics do nothing against viruses.
A few patterns raise suspicion for a bacterial cause. Strep throat, for example, tends to come on suddenly with a significant sore throat and fever but without much cough or runny nose. The combination of high fever, swollen tonsils with white patches, and tender neck lymph nodes is a classic strep pattern. Notably, if you have a lot of coughing and nasal congestion alongside the sore throat, that actually points away from strep and toward a viral cause.
Symptoms That Signal Something More Serious
Most URIs are mild and self-limiting. But certain symptoms suggest complications have developed or something other than a routine cold is going on. Watch for high fever (not the low-grade kind typical of a cold), significant difficulty breathing or wheezing, a productive cough that worsens rather than improves over time, or symptoms that get better and then suddenly get worse again. That “improvement then relapse” pattern is one of the more reliable signals that a bacterial infection may have set in on top of the original viral illness.
Shortness of breath, persistent chest tightness, or any trouble breathing moves the situation out of standard URI territory and warrants prompt attention. The same applies to a sore throat so severe that swallowing liquids becomes difficult, or a fever that climbs well above the mild range typical of a cold.