Croup In Children: Symptoms, Causes, Risks And Treatment

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Croup in kids occurs due to a viral infection in the vocal cords and the trachea (windpipe). The infection causes swelling and narrowing of the upper airway, making it difficult for air to pass through. It is characterized by a harsh, barking cough, hoarseness, and high-pitched noise while breathing in (1).

Croup infection usually affects young children, and the symptoms are generally mild and can be treated at home. However, severe and prolonged croup infections may cause breathing difficulties and warrant hospitalization (1) (2).

Read on to learn about the causes, symptoms, risk factors, and treatment options for croup in children.

In This Article

What Causes Croup In Children?

Several viruses can cause croup in kids

Image: Shutterstock

Croup is commonly caused by the human parainfluenza virusiXCauses upper and lower respiratory infections in children and adults, such as colds, pneumonia, and bronchitis. (types 1 and 3). However, influenza A and B viruses, respiratory syncytial virusiXMostly causes mild respiratory infections such as the common cold in otherwise healthy children. , rhinovirus, coronavirus, human metapneumovirusiXCauses upper and lower respiratory infections in children, older adults, and those with weak immune systems , and adenovirus may also cause croup infection.

Viral croup is the second most common cause of respiratory distress in children below ten years, and the viral infection affects boys more than girls (3).

Symptoms Of Croup In Children

Croup generally begins with cold-like symptoms, such as a runny nose, fever, and cough. The following symptoms are observed after 24–72 hours of infection. The symptoms seem to worsen during the night and fluctuate, depending on whether the child is calm or agitated (1) (3).

The main symptoms include:

  • Harsh coughing, which often sounds like barking
  • Noisy breathing with a high-pitched, squeaky sound, known as stridor

The symptoms can be categorized based on the level of severity.

Mild infection

  • Occasional barky cough
  • Stridor while sleeping or not present at all
  • Mild indrawing of area above neck called supraclavicular area

Moderate infection

  • Frequent barky cough
  • Easily audible stridor during sleep
  • Limited or no distress
  • Visible indrawing of supraclavicular area


  • Frequent barky cough
  • Prominent stridor during inhalation and occasional stridor while exhaling
  • Noticeable distress or agitation
  • Lethargy
  • Severe indrawing of supraclavicular area
  • Can lead to complete obstruction of airways and failure of breathing, if not treated in time Severe indrawing of supraclavicular area
  • Can lead to complete obstruction of airways and failure of breathing, if not treated in time
Severe croup in kids can lead to failure of breathing

Image: Shutterstock

Other symptoms include

  • Sneezing and a runny nose
  • Fever
  • Hoarse voice
  • Red eyes
  • Poor appetite

The symptoms are short-lived. Approximately 60% of children experience a reduction of barky cough by 48 hours or less, and only in about less than 2% of children, the cough might persist for more than five nights (3).

Who Are At Risk Of Contracting Croup?

The risk of contracting croup infection increases based on the age of the child and specific seasons. It is commonly seen in children between six months and three years. However, it can occur in children up to six years of age. Croup infections occur in a predictable pattern, with the infections seen in late fall and winter.

Recurrent croup infections (more than two episodes per year) are found in children who

  • Had prior intubationsiXThe process of making a person breathe by passing an endotracheal tube into the patient's airway through the nose or mouth. .
  • Are premature.
  • Are younger than three years.

Gastroesophageal reflux disease (GERD) and asthma are commonly found in patients with recurrent croups, but these may not increase the risk (4).

Quick fact
Croup infections usually peak around two years of age (6)

Is Croup Contagious?

Croup in kids can spread if come into contact with contaminated surfaces

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Yes, croup can spread from one child to another through respiratory droplets when children with croup cough or sneeze. It also spreads when a healthy child touches their face, nose, or eyes after coming into contact with contaminated surfaces, such as doorknobs.

Physical examination and pediatric history are the two diagnostic methods to detect croup in children. In some rare cases, such as when the child is asymptomatic or when the diagnosis is unclear, the doctor might recommend radiography or laryngoscopyiXAn examination of the back of the throat and the voice box using a tube called a laryngoscope. (3) (4).

Quick fact
Blood tests can also help diagnose croup infection in children (6).

Treatment For Croup In Children

Mild to moderate croup infection can be treated at home with oral corticosteroidsiXDrugs that may help reduce inflammation. and nebulized epinephrineiXA neurotransmitter and a hormone used to treat severe allergic reactions . Severe cases require hospitalization. These medications help in minimizing the symptoms by reducing the swelling of the child’s airway. The cough may not reduce, but stridor and inward drawing of chest walls may subside (4).

When your child experiences no stridor or chest wall indrawing at rest, they may go home (if the child is hospitalized). However, your doctor is the best person to estimate your child’s condition.

Point to consider
Antibiotics will not be effective if your child has developed a viral croup (6).

Home-Care Tips For Croup In Children

If your child has a mild infection, you may follow the below home-care tips to relieve the symptoms (3).

  1. Try not to agitate or upset your child, as distress can worsen the stridor and other symptoms.
  2. If your child is crying, place them on your lap in a comfortable position.
  3. Give them fluids to soothe their sore throat.

    Give your kids fluids to soothe their sore throat

    Image: Shutterstock

  4. Ask them to take plenty of rest.
  5. Avoid using humidifiers as they are found to be ineffective in the treatment of croup.
  6. You can give them acetaminophen (paracetamol) but only after consulting your doctor.

When To See The Doctor?

If you find any of the below symptoms in your child, you need to visit your child’s doctor (1) (2).

  • Fatigue or lethargy
  • Decreased levels of consciousness
  • Trouble breathing
  • Body turning blue or pale due to lack of oxygen
  • Sudden high temperature
  • Difficulty swallowing
  • Inability to speak

Prevention Of Croup

You can protect your child from croup infection or prevent your child from infecting someone by taking the following precautions.

  • Make sure they wash their hands before eating and after coming home from school or the playground.
  • Instruct them not to touch their face, nose, or eyes before washing hands.
  • If someone has a croup, ask your child to maintain physical distance until they get well.
  • Keep your child’s vaccinations up to date.
  • Give them nutritious foods that can help boost their immunity.
  • Encourage them to cover their nose and mouth while coughing and sneezing.

    Encourage your kids to cover their nose and mouth when coughing

    Image: Shutterstock

Adults may rarely get infected. However, it is best to be careful while taking care of your child. As the infection is contagious, do not send your child to school until the symptoms subside or for at least three days.

Frequently Asked Questions

1. How long is a child with croup contagious?

People with croup virus may be contagious for three to 16 days (5). You may not notice the symptoms in the initial two to three days, but you will eventually.

2. Does the croup go away on its own?

Yes, a child with a croup infection may feel better within 48 hours without any medical intervention (2). But if your child is suffering, it is better to consult a doctor.

Croup in kids is a contagious viral infection that affects the respiratory system. Mild to moderate croup infection can be treated at home, whereas severe infection warrants hospitalization. In most cases, croup abates in one to two weeks. Taking ample rest and drinking plenty of fluids are simple home remedies that could provide symptomatic relief and hasten recovery. Consult a doctor promptly if the child has additional symptoms, such as troubled breathing. Maintaining proper hygiene and keeping a child’s vaccinations up to date are effective measures to prevent the infection.

Key Pointers

  • Croup is a viral infection, causing respiratory distress in children.
  • Intense coughing, rapid and troubled breathing, fatigue, and rough voice are characteristic signs of this infection.
  • This condition is treatable with oral medications (corticosteroids) and nebulization.
  • Scroll down to know when to contact your child’s healthcare provider.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Croup; The Royal Children’s Hospital Melbourne
2. Croup; NHS
3. Candice L. Bjornson and David W. Johnson; Croup in children; CMAJ (2013).
4. Dustin K. Smith, Andrew J. McDermott, and John F. Sullivan; Croup: Diagnosis and Management; American Family Physician (2018).
5. Parainfluenza; Parainfluenza
6. Croup in Children; Cedar’s Sinai
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