Understanding Upper Respiratory Infections (URIs): Why Antibiotics Aren’t the Answer

Apr 1, 2026 · Last updated · Mason Jones, M.D.

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An upper respiratory infection (URI) is an infection of the nose and throat, and the common cold is the best-known example. Viruses cause the vast majority of URIs. Antibiotics only kill bacteria, so they won’t cure a URI or help you get better faster. Rest, fluids and time will. In the video above, family physician Dr. Mason Jones explains why: the common cold is caused by a virus, and viruses don’t respond to antibiotics at all.

What is an upper respiratory infection?

URI is short for upper respiratory infection: an infection of the upper airways, meaning the nose, sinuses and throat, and sometimes the voice box, as Cleveland Clinic describes it. If a visit note says “acute URI,” acute simply means the illness came on suddenly; it’s the opposite of chronic (MedlinePlus).

A cold is a viral infection of the nose and throat, which is why doctors often call it a URI; MedlinePlus, from the National Institutes of Health, lists “upper respiratory infection” as another name for it. More than 200 different viruses can cause a cold, according to the American Academy of Family Physicians (AAFP). Flu and COVID-19 can start out looking like a cold, but flu usually comes on faster and feels worse. Colds are very common, and the American Academy of Pediatrics (AAP) says young children in child care may catch 6 to 8 a year.

Cold, flu, sinus infection or strep?

Many illnesses start with a stuffy nose or a sore throat. Here is how a typical cold compares with three look-alikes, and which of them antibiotics can help.

Common cold (viral URI) Flu Sinus infection Strep throat
Cause Viruses (more than 200 kinds) Influenza viruses Usually viruses; sometimes bacteria Group A Streptococcus bacteria
How it starts Gradually Suddenly Often during or after a cold Fever may start suddenly
Main symptoms Runny or stuffy nose, sneezing, sore throat, cough; little or no fever in adults Fever (often above 102°F), chills, muscle aches, tiredness, headache, cough Facial pain or pressure, stuffy nose, post-nasal drip, headache Red, sore throat (sometimes with white patches), pain when swallowing, fever, swollen neck glands; a runny nose and cough point to a virus instead
Antibiotics? No No; prescription antivirals may help if started early Usually not; most get better on their own Yes, when a test confirms strep

Symptoms overlap, so the table is a guide, not a diagnosis. If you’re not sure what you have, ask a doctor.

What Dr. Jones says in the video

Dr. Jones explains that URI stands for upper respiratory infection, and that the cause, the vast majority of the time, is a virus. Many different viruses can be responsible, and they have long, complicated names, but they are all viruses. The common cold is one of them, and it doesn’t respond to an antibiotic at all.

He says a patient will sometimes come in expecting an antibiotic. When that happens, he talks it through with them and explains what he thinks is going on. Treatment for a cold is supportive care. Even a powerful broad-spectrum antibiotic, which he calls “the big gun,” probably won’t change your symptoms.

There’s also a real downside. Dr. Jones points out that if everyone with a cold were given antibiotics, the drugs would wipe out many of the bacteria we all normally carry on our bodies, including the ones in the digestive tract.

Symptoms of a cold or URI

MedlinePlus says symptoms usually start 2 to 3 days after you’re exposed. Common symptoms include:

  • runny or stuffy nose and sneezing
  • sore or scratchy throat
  • cough
  • headache and muscle aches
  • a low fever or none in adults and older children; young children often run a fever of about 100°F to 102°F

Colds spread through droplets from coughs, sneezes and nose-blowing, and through hands that touch a contaminated object, like a toy or doorknob, and then the eyes, nose or mouth. There’s no test for a cold; doctors diagnose it from your symptoms, according to familydoctor.org from the AAFP.

Why antibiotics don’t help, and how they can hurt

Antibiotics don’t treat colds or runny noses, even when the mucus turns thick, yellow or green, according to MedlinePlus and the AAP. They also don’t treat flu, most sore throats or most chest colds. Most sudden sinus infections are viral and shouldn’t be treated with antibiotics, says ENT Health from the American Academy of Otolaryngology, and the AAP says at least half of ear infections clear up without them. An antibiotic you don’t need still carries risks:

  • Side effects such as diarrhea, vomiting, stomach pain and rashes. The AAP says they happen in up to 1 in 5 children who take an antibiotic and are a common reason children end up in the emergency room.
  • Allergic reactions, some of them serious or life-threatening.
  • C. diff infection: when antibiotics upset the normal gut bacteria Dr. Jones describes, C. diff can overgrow, causing watery diarrhea and, in severe cases, serious colon damage or death (MedlinePlus).
  • Antibiotic resistance: overusing or misusing antibiotics can make bacteria change so the drugs work less well. It’s the germs that change, not your body. Resistant infections are harder to cure and can spread to other people (AAP).

What helps: treatment for a URI

There’s no cure for the common cold, but it usually gets better on its own. To feel better in the meantime, the AAP, the FDA and the AAFP suggest:

  • plenty of rest and fluids
  • a clean cool-mist humidifier (the FDA advises against warm-mist ones for children)
  • saline nose spray or drops; for babies, a rubber suction bulb can clear mucus
  • breathing steam from a warm shower
  • throat lozenges or cough drops, but not for children under 4, who can choke on them (AAP)
  • honey for a cough in adults and children 1 year and older (never give honey to babies under 1)
  • an over-the-counter pain reliever or fever reducer, after asking your doctor or pharmacist which one suits you, and following the label

The AAP says not to give over-the-counter cough and cold medicines to children under 4, and to give them to children 4 to 6 only if their doctor recommends it.

For flu or COVID-19, prescription antiviral medicines may help. The FDA says flu antivirals work best when started within 48 hours of the first symptoms, and COVID-19 treatments should start as soon as possible after diagnosis.

When it might be something else

Besides flu and strep (see the table above, and Strep Throat vs. Viral Sore Throat), a cold can lead to:

  • A sinus infection: facial pain or pressure, a stuffy nose, headache and post-nasal drip. Most are viral and improve without antibiotics. ENT Health says bacteria are more likely if you don’t improve at all within 10 days, or you improve and then get worse.
  • Pneumonia: a lung infection. The National Heart, Lung, and Blood Institute (NHLBI) says bacterial pneumonia can follow a cold or flu, and it’s one of the cases where a doctor may prescribe antibiotics. Symptoms include cough, fever or chills, shortness of breath and chest pain when breathing or coughing.
  • Other problems: MedlinePlus says colds can lead to ear infections and bronchitis, and are the most common trigger of wheezing in children with asthma. Flu can also worsen long-term conditions such as diabetes and heart disease (AAFP).

When to see a doctor

See a doctor if you or your child has:

  • symptoms that get worse, or that don’t improve after 7 to 10 days (MedlinePlus)
  • in a child, a fever that lasts more than 24 hours under age 2, or more than 3 days at age 2 and older (AAP)
  • in an adult, a high fever above 102°F that won’t go away, with tiredness and body aches (AAFP)
  • symptoms, such as fever or cough, that get better and then come back or get worse
  • ear pain or drainage from the ear, or severe sinus pain
  • a long-term health condition, such as diabetes or heart disease, that gets worse

MedlinePlus advises people at higher risk of flu complications to contact a doctor if they get the flu. They include adults 65 and older, children under 5, women more than 3 months pregnant, and people with long-term heart, lung or kidney disease, diabetes or a weakened immune system.

Get care right away for trouble breathing, which MedlinePlus calls an emergency, and for chest pain or pressure, fainting, confusion or seizures (AAFP). In children, also watch for fast breathing, flaring nostrils, skin between the ribs pulling in with each breath, and blue lips or nails. The AAP says to call your pediatrician right away for a fever of 100.4°F or higher in a baby under 3 months, or a temperature that keeps rising above 104°F at any age. If you think it’s an emergency, call 911.

How to prevent upper respiratory infections

There’s no vaccine for the common cold, but these steps help:

  • Wash your hands often with soap and water, or use a hand sanitizer with at least 60% alcohol (MedlinePlus).
  • Avoid touching your eyes, nose and mouth after touching shared objects, and clean surfaces such as doorknobs and toys often.
  • Cough and sneeze into the inside of your elbow, and stay home when you’re sick (AAFP).
  • Keep babies 3 months and younger away from people who are sick (AAP).
  • Get a flu vaccine every year.

Find a doctor

For a cold that lingers or gets worse, start with a family physician. For repeated sinus problems, an ear, nose and throat (ENT) specialist can help. Doctors on Best Docs Network who treat these conditions include:

More videos on this topic: Ear, Nose & Throat and General Health.

Frequently asked questions

Is an upper respiratory infection the same as a cold?

Mostly, yes. MedlinePlus lists “upper respiratory infection” as another name for the common cold.

Do I need antibiotics for an upper respiratory infection?

Usually not. Most URIs are caused by viruses, which antibiotics can’t kill. You’d need one only if a doctor finds a bacterial infection, such as strep throat or bacterial pneumonia.

What is the best antibiotic for an upper respiratory infection?

For most URIs, there isn’t one: antibiotics don’t work on viruses, which cause most URIs (Cleveland Clinic). If a doctor confirms a bacterial infection, such as strep throat, they’ll prescribe the right medicine for that infection. The AAP also advises against keeping leftover antibiotics: return them to a pharmacy or a drug take-back program.

Does green or yellow mucus mean I need antibiotics?

No. Mucus often turns thick and yellow or green a few days into a cold. That’s a normal part of a viral infection, and the AAP says it can last up to 10 days.

How long does a URI last?

Most colds clear up in about a week. A cough from a chest cold can hang on for several weeks, according to the AAFP. See a doctor if symptoms get worse or don’t improve after 7 to 10 days.

How long is a URI contagious?

MedlinePlus says people are most contagious in the first 2 to 3 days and usually aren’t contagious after the first week.

Sources

This page is for general information only and is not medical advice. Talk with a qualified health professional about your own situation. If you think you may have a medical emergency, call 911.

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