The common cold typically starts with a sore or scratchy throat and a runny nose, then progresses to congestion, sneezing, and a cough over the next few days. Most colds resolve within 7 to 10 days, though some symptoms like a lingering cough can stick around a bit longer.
The Main Symptoms
Cold symptoms are familiar to most people, but they don’t all show up at once. They tend to build gradually, usually starting 1 to 3 days after you’re exposed to a virus. The core symptoms include:
- Runny or stuffy nose
- Sore or scratchy throat
- Cough
- Sneezing
- Mild headache
- Slight body aches
- Low-grade fever
- Generally feeling unwell
Not everyone gets every symptom. You might have a miserable sore throat with barely any congestion, or a nose that won’t stop running while your throat feels fine. The combination varies depending on which of the 200-plus cold viruses you’ve caught and how your immune system responds.
How Symptoms Change Day by Day
A cold follows a fairly predictable arc. The sore throat is usually the first thing you notice, often appearing a day or two before congestion sets in. By days 2 through 4, nasal symptoms tend to peak: your nose runs constantly, congestion builds, and sneezing picks up. A cough typically develops around this time as well, triggered by mucus draining down the back of your throat.
Your nasal mucus tells its own story as the cold progresses. It usually starts out watery and clear, then becomes thicker and more opaque over the next few days, often turning yellow or green. This color change comes from an increase in immune cells and the enzymes they produce as your body fights off the virus. It does not automatically mean you have a bacterial infection. After a few more days, the discharge tends to clear up or dry out as you recover.
By days 7 through 10, most symptoms have faded. A mild cough or slight congestion can linger a few days beyond that, but the worst is typically behind you by the end of the first week.
Cold vs. Flu vs. Allergies
The overlap between these three is what sends most people to a search engine. Here’s how to tell them apart.
Flu hits harder and faster. While a cold creeps in with a scratchy throat, the flu often starts with sudden exhaustion, high fever (100 to 102°F or higher), significant body aches, and a headache. Extreme exhaustion at the onset is a hallmark of the flu and never happens with a cold. Fatigue from the flu can last up to three weeks, compared to the mild tiredness you might feel with a cold. Both cause coughing, but flu coughs tend to become more severe.
Allergies share the sneezing and stuffy nose of a cold, but they never cause fever and rarely cause body aches. The telltale sign of allergies is itchy, watery eyes, which almost never accompany a cold. The other major clue is timing: colds wrap up within two weeks at most, while allergy symptoms last as long as you’re exposed to the trigger, sometimes six weeks or more during pollen season.
Less Common Complications
Most colds are nothing more than a nuisance. But in some cases, the viral infection opens the door to secondary problems. These can include sinus infections, middle ear infections, bronchitis, and, less commonly, pneumonia. People with asthma may find that a cold triggers wheezing or difficulty breathing.
Signs that a cold may have turned into something more serious include a fever that returns after it had gone away, symptoms that get significantly worse after the first week instead of improving, or persistent thick green mucus lasting well beyond the normal timeline.
Cold Symptoms in Babies
Babies get the same basic symptoms as adults (stuffy nose, sneezing, coughing, mild fever), but they can’t blow their nose or tell you what hurts. The congestion often causes the most trouble, making it hard for them to nurse or take a bottle. Fussiness and poor sleep are common because a plugged nose is especially uncomfortable for infants who breathe primarily through their noses.
Their nasal mucus follows the same pattern as in adults: clear at first, then thicker and yellow or green before clearing up. A few warning signs in babies warrant prompt attention: refusing to drink fluids, coughing hard enough to cause vomiting or skin color changes, wheezing or labored breathing, or fewer wet diapers than usual. For babies 3 months and older, a temperature above 100.4°F, signs of ear pain, or eye discharge also call for a check-in with a pediatrician.
What Mucus Color Actually Means
Green or yellow mucus is one of the most misunderstood cold symptoms. Many people assume it signals a bacterial infection that needs antibiotics, but during a viral cold, colored mucus is a normal part of recovery. It simply reflects your immune system doing its job. The color comes from enzymes inside white blood cells that accumulate as they fight the virus.
There is one useful distinction, though. When a bacterial illness is involved, thick colored mucus tends to appear right at the start. With a viral cold, the mucus starts clear and gradually thickens over several days. So if you wake up on day one with dense green discharge and no preceding clear-mucus phase, that pattern is more consistent with a bacterial cause.