Nasal Cannula: A Comprehensive Guide to Supplemental Oxygen Therapy

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026

TL;DR: A nasal cannula is a thin, flexible medical device that delivers supplemental oxygen through two prongs resting in the nostrils. Many patients prefer it because they can eat and talk while using it. It comes in high-flow and low-flow models, supports a wide range of respiratory conditions, and can improve quality of life by reducing fatigue and improving sleep.

Quick answer: A nasal cannula is a lightweight tube that delivers supplemental oxygen directly into the nose. Two small prongs sit in the nostrils and a tube connects to an oxygen source. It is used for conditions such as COPD, asthma, and heart failure. Unlike an oxygen mask, a cannula lets you eat and speak comfortably during therapy.

Understanding the Nasal Cannula

The nasal cannula is a fundamental tool in respiratory care, designed to give extra oxygen to people who cannot maintain adequate oxygen levels on their own. It is a thin, flexible plastic tube that loops over the ears and around the head, with two small prongs that rest comfortably inside the nostrils. Connected to an oxygen source such as a tank or concentrator, it provides a steady supply of oxygen to the body's organs.

Healthcare providers recommend nasal cannulas for many conditions. Respiratory illnesses such as COPD, asthma, bronchitis, and pneumonia are common reasons for use. It also supports patients with heart failure or sleep apnea, and people traveling to high altitudes. The device is suitable across all stages of life, from newborns with underdeveloped lungs to adults with chronic respiratory conditions. If you use inhaled medicines too, see our guide to inhaler use.

Figure 1: A nasal cannula correctly positioned, with the prongs in the nostrils and the tubing looped over the ears.

High-Flow vs. Low-Flow Systems

Nasal cannulas fall into two main types based on the volume and temperature of the oxygen they deliver. The right choice depends on the patient's medical needs and the severity of their condition.

• Low-flow (LFNC): Delivers up to 6 liters per minute (LPM) at room temperature, without humidification. It is used for standard home care and stable respiratory conditions.

• High-flow (HFNC): Delivers up to 60 LPM of warmed, humidified oxygen. It is used in hospital settings and for acute respiratory distress.

Low-flow systems are common for long-term home use but can cause nasal dryness because the oxygen is not moisturized. High-flow systems deliver warmed, humidified oxygen, which keeps the nasal passages from drying out and lowers the risk of nosebleeds, making them suitable for patients who need higher oxygen concentrations. For related breathing support at night, see our guides to the APAP machine and adaptive servo-ventilation (ASV) machines.

Figure 2: A low-flow cannula system compared with a high-flow system that includes a heated humidifier and insulated tubing.

Benefits and Quality of Life

The main advantage of the nasal cannula over other oxygen delivery methods, such as face masks, is its minimal effect on daily activities. Because it occupies only the nostrils, patients can eat, drink, and talk without interruption. This convenience improves quality of life and helps people stick with their prescribed therapy.

Supplemental oxygen through a cannula also brings physical benefits. It reduces the effort needed to breathe, which lowers fatigue and raises energy. Patients often report better sleep and a greater ability to socialize, exercise, and travel, supporting independence and well-being.

Home Use and Safety Protocols

Using a nasal cannula at home requires careful equipment maintenance and strict safety habits. Oxygen supports combustion and makes fires burn more intensely, so its presence in the home carries specific risks.

Maintenance

• Change the nasal cannula: Weekly.

• Change the long tubing: Monthly.

• Disinfect the prongs: Between uses, with alcohol.

• Check equipment: Daily, and make sure a backup power source is available.

Safety Rules

• Keep oxygen equipment at least 5 feet away from open flames, including stoves and candles.

• Never smoke while using oxygen.

• Avoid aerosol sprays nearby.

• Keep a backup generator or alternative oxygen source ready for power outages, since some systems rely on electricity.

Figure 3: Key home oxygen safety rules, including no smoking and keeping equipment away from open flames.

Conclusion

The nasal cannula remains a cornerstone of supplemental oxygen therapy, combining clinical effectiveness with patient comfort. Whether used for short-term recovery or long-term management, it supplies the oxygen the organs need. By following maintenance and safety guidelines, patients can fit oxygen therapy safely into daily life and stay active, connected, and supported.

Next Steps

• Review your prescription: Make sure you understand the exact flow rate (LPM) your provider prescribed.

• Set a maintenance schedule: Create a calendar reminder to change your cannula weekly and your long tubing monthly.

• Inspect your home: Remove open flames and fire hazards from areas where you use oxygen.

• Discuss long-term needs: If you need oxygen for an extended period, ask your provider about the best portable options for your lifestyle.

Frequently Asked Questions

What is a nasal cannula?

It is a medical device made of a flexible tube and two prongs that deliver extra oxygen through the nose.

Can I eat while using a cannula?

Yes. It does not cover your mouth, so you can eat and talk freely.

How often should I change the cannula?

Change the nasal prongs at least once a week for hygiene and effectiveness.

Is oxygen flammable?

Oxygen itself does not burn, but it supports combustion, making other materials burn more easily and intensely.

What is the difference between high-flow and low-flow?

High-flow systems deliver more oxygen and are typically warmed and humidified to prevent nasal dryness.

Can a nasal cannula cause nosebleeds?

Yes. Dry oxygen can dry out the nasal passages. A water-based ointment or a humidifier can help prevent this.

Do I need a prescription for oxygen?

Yes. Oxygen is considered a medication and must be prescribed by a healthcare provider.

How do I clean my cannula?

Disinfect the prongs between uses with an alcohol wipe or a cotton pad with alcohol.

Can I use a cannula while sleeping?

Yes. Many people use supplemental oxygen during sleep to treat conditions such as sleep apnea.

What should I do during a power outage?

Keep a backup oxygen tank or generator ready if your primary oxygen concentrator needs electricity.

Why does the tube go over my ears?

Looping the tube over the ears keeps the cannula in place and prevents the prongs from falling out.

What are liters per minute (LPM)?

LPM is the flow rate, or the volume of oxygen delivered to you every minute, as prescribed by your doctor.

Can newborns use a nasal cannula?

Yes. It is often used for infants with underdeveloped lungs or breathing difficulties at birth.

What is oxygen toxicity?

It is lung damage caused by breathing too much supplemental oxygen, so always follow your prescribed flow rate.

When should I call my doctor?

Call right away if you have blue lips, rapid breathing, fever, or extreme shortness of breath.

Medical Disclaimer

The information in this article is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare professional before starting any new treatment or changing your medical care routine.

Source date: August 4, 2023.