Coryza is the medical name for the runny, blocked, sneezy nose of a head cold, an irritated and inflamed lining inside the nose.1Wikipedia. Rhinitis When a doctor or a medical record says coryza, it usually means you or your child has an ordinary cold rather than something unusual.2Wikipedia. Rhinitis Today coryza often appears as one item in a list of symptoms, such as “fever, cough, coryza.” Rhinitis is the broader term for any inflamed nose lining, including allergies. The word describes a symptom, not one illness, so the same runny nose turns up in flu, COVID-19 and measles too. Because it is almost always viral, it goes away by itself, and the useful treatments make you more comfortable while it does.
What Happens Inside Your Nose
When a cold virus infects the nose, the lining releases chemical alarm signals that act on nearby blood vessels.3PubMed Central. Pathophysiology of nasal congestion The vessels leak fluid and swell with blood, which produces the drip and the blocked feeling.4PubMed Central. Pathophysiology of nasal congestion The same signals make the nasal nerves extra sensitive, which is why you sneeze so easily.5PubMed Central. Pathophysiology of nasal congestion Immune cells then pour into the lining to fight the infection, much as they do in hay fever.6PubMed Central. Pathophysiology of nasal congestion So the stuffiness and drip are your own defences at work, not the virus itself.
The clear, watery drip early in a cold is mostly fluid leaking from those vessels plus extra secretions from the lining, which is why it can feel like a tap. Your nose makes mucus all the time, and it normally gets swept to the back of the throat unnoticed. A cold increases the amount enough that you notice it. That mucus dripping or being swallowed at the back of the throat is why a sore throat or tickly cough often goes with a head cold.
Swollen vessels on one side can block one nostril at a time, so the stuffiness seems to swap sides. Lying flat lets more blood pool in the nose, which is why nights feel worse. Propping your head up on an extra pillow can make breathing through the nose easier.
Viruses That Cause Coryza
Rhinoviruses cause most colds, roughly 50 to 80 percent of them.7Patient. Common cold Coronaviruses, flu viruses, parainfluenza, RSV, enteroviruses and adenoviruses can all cause it too.8Patient. Common cold With so many different viruses to meet, catching several colds a year is normal. Fever, cough and loss of taste or smell with a runny nose may point to COVID-19, so if you have those symptoms, taking a COVID test is worthwhile.9Patient. Common cold
Cold viruses travel in tiny particles that come out when an infected person talks, coughs, sneezes or breathes.10Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses You catch them by breathing the particles in or when they land on your eyes, nose or mouth.11Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses Being close to a sick person raises your risk, and crowded, poorly ventilated rooms let some viruses spread further.12Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses Viruses can also survive on surfaces and reach your face from your hands.13Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses
Because colds are viral, antibiotics don’t help: they kill bacteria. Taking them for a cold adds side effects without shortening the illness. They matter only if a bacterial complication, such as an ear infection, develops later.
An allergic runny nose causes similar swelling, but it is triggered by pollen, dust or pets rather than a virus. Allergy symptoms come back with the same exposure and often bring itchy eyes. A cold usually brings a sore throat or tiredness and runs its course in days.
Symptoms and How Long Coryza Lasts
The core symptoms are a runny nose, a blocked nose and sneezing.14PubMed Central. THE COMMON COLD Fever, cough, sore throat or watery eyes may or may not come along.15PubMed Central. THE COMMON COLD Mucus is usually plentiful and thin for the first two days, then becomes thicker and yellow or green.16PubMed Central. THE COMMON COLD Colored mucus on its own is a normal stage of a cold, not proof of bacterial infection.
A typical cold often starts with a scratchy throat, followed by sneezing and a streaming nose. Days two to four are often the stuffiest and most tiring. After that the mucus thickens and the nose slowly clears through the second week.
Symptoms can last anywhere from a single day to more than 14 days.17PubMed Central. THE COMMON COLD Most people feel better within one to two weeks.
A cough can outlast the runny nose by a week or two, because the airways stay irritated after the virus has gone. A lingering cough that is slowly improving is usually part of recovery, not a sign that the cold has come back. A cough that is getting worse, or comes with breathlessness or wheezing, is different from a leftover cough and deserves a check.
Children catch more colds because their immune systems are meeting these viruses for the first time. Babies breathe mainly through the nose, so congestion can make feeding hard. Saline drops and gentle suction can help a baby feed and sleep.
Treatments That Actually Help
Treatment for a cold is supportive: pain relievers, saline and limited decongestant use.18Saudi Journal of Medicine and Public Health. Comprehensive Clinical Perspectives on Upper Respiratory Tract Infections: A Multidisciplinary Focus on the Common Cold Saltwater nasal sprays or drops moisten the nose and loosen thick mucus so it clears more easily, and they are safe at any age.19MIN Clinic. Runny Nose, Acute Rhinitis & Rhinopharyngitis: Causes, Symptoms & Treatment A cool-mist humidifier can also soothe irritated nasal passages.20MIN Clinic. Runny Nose, Acute Rhinitis & Rhinopharyngitis: Causes, Symptoms & Treatment
To use saline well, blow gently first so the saline reaches the swollen lining. Tilt your head slightly forward, not back, so it doesn’t run down your throat. You can safely use it several times a day. Shop-bought sterile saline is safer than homemade mixes made with tap water.
A decongestant is a medicine that shrinks the swollen blood vessels in the nose.21Marley Drug Blog. Oral Versus Nasal Decongestant: Which is Right for Me A xylometazoline spray clears a blocked nose much better than a dummy spray for up to 10 hours.22PubMed. Effects of intranasal xylometazoline, alone or in combination with ipratropium, in patients with common cold Its side effects are usually mild, such as blood-tinged mucus or an occasional nosebleed.23PubMed. Effects of intranasal xylometazoline, alone or in combination with ipratropium, in patients with common cold But using a spray for more than about three days in a row can cause rebound congestion, a stuffiness that returns worse when you stop.24Marley Drug Blog. Oral Versus Nasal Decongestant: Which is Right for Me
Use the spray only when you are actually blocked, such as at bedtime to help you sleep, rather than on a fixed schedule all day. Follow the label dose and stop after about three days, even if you still feel stuffy. If you already have rebound congestion, stopping the spray is the cure, though the first day or two off it can feel worse. Switch to saline after that. Check the label for age limits, because many sprays are not meant for young children.
Decongestant tablets last longer than sprays but act on the whole body.25Marley Drug Blog. Oral Versus Nasal Decongestant: Which is Right for Me They can raise heart rate and blood pressure or make you jittery.26Marley Drug Blog. Oral Versus Nasal Decongestant: Which is Right for Me People with high blood pressure or heart problems should check with a pharmacist first. Antihistamines ease overall cold symptoms slightly on the first day or two, helping about 45 in 100 people compared with 38 on a dummy pill.27PubMed Central. Antihistamines for the common cold After three days they work no better than nothing.28PubMed Central. Antihistamines for the common cold
Many combination cold products contain a decongestant, a painkiller and an antihistamine together, so read the label. If you take another painkiller, check you aren’t doubling up on paracetamol. The sedating antihistamines in night formulas mainly help you sleep, not unblock the nose.
Drinking enough fluids keeps mucus thinner and helps you feel better, though it won’t speed up the cold itself. Breathing steam from a warm shower can feel soothing for a short time, but it doesn’t treat the infection, and hot water from a bowl risks scalds, especially for children. Extra rest helps too, because a stuffy nose and poor sleep make a cold more tiring than the virus alone would.
When Coryza Becomes Something More
Ear and sinus infections sometimes follow a cold.29Journal of the American Medical Association. THE PREVENTION OF EAR AND NASAL SINUS COMPLICATIONS OF THE COMMON COLD Bacteria can invade once the virus has inflamed the nose, causing longer symptoms and complications.30Journal of the American Medical Association. THE PREVENTION OF EAR AND NASAL SINUS COMPLICATIONS OF THE COMMON COLD
A cold that seems to be getting better and then worsens with new fever or pain, or symptoms that last well beyond two weeks, can suggest a bacterial complication. An ear infection often shows as ear pain, and in small children as tugging at the ear, crying more, poor sleep or fever. A sinus infection tends to bring facial pain or pressure, often on one side, and a blocked nose that does not improve.
Coryza is also a classic sign of measles, alongside fever, cough, red eyes and a rash.31PubMed. An Update and Review of Measles for Emergency Physicians A high fever with red eyes and a spreading rash needs urgent medical advice, especially in an unvaccinated child.
Flu usually hits suddenly with high fever and body aches, and muscle aches and chills tend to persist. A cold builds gradually and stays mostly in the nose and throat.
Get medical help for any of these:
- Ear pain, or pain and swelling around the eyes or cheeks
- Fever above 39°C or lasting more than three days
- Difficulty breathing, chest pain, or a baby struggling to feed
- Severe headache with a stiff neck, which needs emergency care
A doctor will ask how long symptoms have lasted and whether they improved first, and will usually examine the ears, throat and chest. Antibiotics are only prescribed when a bacterial infection looks likely, and many ear and sinus infections clear on their own. If a COVID or flu swab is suggested, it is to find out what is causing the illness, since some have specific treatments.
How to Avoid Catching or Spreading It
Wash or sanitize your hands often and avoid touching your eyes, nose and mouth.32Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses Don’t share cups, utensils or towels, and keep your distance from anyone with symptoms.33Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses Opening windows and doors improves ventilation and lowers risk indoors.34Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses Clean often-touched items like phones and door handles regularly.35Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses Staying up to date with vaccines protects against flu, COVID-19 and measles, which can all start with a runny nose.36Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses When viruses are circulating, a mask in crowded indoor places such as public transport adds protection.37Australian Government Department of Health and Aged Care. Preventing the spread of respiratory viruses
Wash with soap and water for around 20 seconds, covering palms, backs of hands, between fingers and under the nails. Soap and water is best when hands are visibly dirty, and an alcohol-based sanitizer is a good option when you have no sink. Wash after coming home, before eating and before touching your face, since those are the moments when viruses most easily reach your nose.
Most people touch their face many times an hour without noticing, so it is easier to wash hands than to stop the habit. Keeping tissues handy gives your hands something to hold instead of rubbing your nose or eyes.
If you have a cold, cough or sneeze into a tissue or your elbow and bin tissues straight away. Wash your hands after blowing your nose. Stay home on the worst days, especially around babies or frail relatives.
Coryza in Chickens and Cats
In chickens, infectious coryza is a bacterial disease causing swollen faces, nasal discharge and sore eyes.38Journal of Advanced Veterinary Research. Global perspectives on infectious coryza: Pathology, immunity, and economic impact in chickens It cuts growth and egg laying in flocks.39Journal of Advanced Veterinary Research. Global perspectives on infectious coryza: Pathology, immunity, and economic impact in chickens In severe cases it can spread to the ears and brain.40PubMed Central. Otitis and meningoencephalitis associated with infectious coryza (Avibacterium paragallinarum) in commercial broiler chickens In cats, similar nose and eye signs usually come from cat flu viruses.41PubMed. Molecular epidemiology of feline calicivirus (FCV) and felid alphaherpesvirus 1 (FeAHV-1) in cats with clinical signs and clinically healthy cats A backyard keeper seeing these signs should contact a vet, since antibiotics or vaccines may be needed. Chicken coryza and cat flu are not the same as a human cold.
Affected birds often have swollen faces, discharge from the nose and eyes, and sometimes a bad smell, and may eat and drink less. It spreads through shared air, drinking water and contact between birds, so one infected bird can put the whole flock at risk. Some recovered birds keep carrying the bacteria without looking ill, which is why it can return to a flock. Sick birds should be isolated from the flock to limit spread.