Using your CPAP in Winter with Colds & Flu

cpap therapy in winter resmed UK blog-uk

August 10th 2016

Winter can be a challenging time for CPAP users. The lack of humidity in the dry cold winter air, combined with use of CPAP therapy can cause the nasal passages to become dry while using CPAP with a cold or flu can only make matters worse.

One of the main functions of the nose is to warm and moisten the air you breathe. If the air is cold tiny blood vessels inside the nostrils dilate to help warm up the air but the extra blood flow causes the airway to narrow and leads to additional mucus production to protect its sensitive tissues and to add more moisture to the inhaled air. Unfortunately, this may cause nasal congestion and a runny nose.

If the air through the mask does feel too cold and your sleep is disrupted there are some simple remedies that can be tried to overcome this:

  • Try closing the windows and heating the bedroom.
  • Also try placing the tubing under the bedclothes as heat from the body will increase the temperature of the air passing through it.

Upper respiratory tract infections, colds and flu


It’s never easy to sleep when you have an upper respiratory tract infection, a cold or flu, but for people on CPAP therapy, it is more difficult to tolerate treatment at this time.

Stopping using your CPAP when you have a cold is not advised as it can make other cold symptoms such as a sore throat a lot worse. However if you are too uncomfortable or if you experience ear pressure or pain or have any other concerns, contact your GP or medical provider.

Again there are some simple remedies that can be tried to make treatment more comfortable when you do have a cold.

  • Use of a saline nasal spray to add moisture to the sinus passages can relieve swelling and help you breathe easier.
  • Decongestants can help although these can take a while to work so they need to be used early enough so that they take effect by bed time.
  • An ‘over the counter spray’ such as Beconase can be used to decrease inflammation in the nasal passages and help reduce the swelling of the nasal mucosa. This is only recommended for short term use i.e. less than three days. If you are taking any other medicines, including those bought without a prescription and herbal medicines, you should check with your pharmacist before you start treatment with this.

Under no circumstances be tempted to add Olbas oil or similar decongestants to the water in your humidifier and do not put it on the filter of your device as this can damage your equipment

Use a Full-Face mask


Most CPAP masks are nasal masks so require you to breathe only through your nose, but when nasal congestion develops, it becomes difficult to do this. Nasal congestion or resistance as experienced during a cold can lead to you breathing through your mouth. When air from your CPAP device escapes through your mouth (mouth leak) it can be a significant problem that may compromise the effectiveness of your CPAP therapy. Mouth leak causes high airflow in one direction, preventing the lung’s moist air from passing back through the nose which results in drying of the skin in the nose, nasal congestion, and flu-like symptoms upon awakening.

Many people who routinely use nasal masks with their CPAP treatment purchase a Full-Face CPAP mask for use when they have a cold or an upper respiratory tract infection. Use of this type of mask will ensure that if you do revert to breathing through your mouth treatment can still be used and it will continue to be effective.

Add heated humidification

Use of heated humidification with CPAP treatment is recognised as the most effective method of preventing or reversing the symptoms resulting from cold air or an upper respiratory tract infection as the air is warmed and moistened before it reaches the nose. This will help with nasal congestion, ease inflamed nasal passages and make the air more comfortable to breathe. If you are using a ResMed device there will be a humidifier available to fit your CPAP machine.


Some people using heated humidification can experience a problem known as ‘rainout’ during cold weather when the warmed moistened air coming from the humidifier is cooled by room air as it moves down the tube towards the mask and moisture in the cooler air returns to a liquid.

This can result in droplets of water or condensation to gather in the tube and mask.

There are several ways to lessen the problem of ‘rainout’ and the following may help:-

  • Always have the device and humidifier positioned lower than the bed.
  • Close the bedroom window, turn the humidifier down or raise the temperature in the bedroom at night to lessen the difference between the temperature in the room and the tube.
  • Tuck the tube under the bedclothes to keep it warm.
  • Insulate the hose by covering it with a tubing wrap. Custom made ones can be purchased from ResMed or alternatively you can make your own by wrapping a towel, scarf, bubble wrap or aluminium foil around the tube

You can call ResMed customer service team on 0800 917 7071 or fill the form here. One of our trained and experienced team will be happy to advise you.

This blog post contains general information about medical conditions and treatments. It is not intended to be a substitute for professional medical advice, diagnosis or treatment. The information is not advice, and should not be treated as such. You must not rely on the information on this website as an alternative to medical advice from your doctor or other professional healthcare provider.

If you have any specific questions about any medical matter, you should consult your doctor or other professional healthcare provider. If you think you may be suffering from any medical condition, you should seek immediate medical attention. You should never delay seeking medical advice, disregard medical advice, or discontinue medical treatment because of information on this website. The views expressed on this blog and website have no relation to those of any academic, hospital, practice, or other institution with which the authors are affiliated and do not directly reflect the views of ResMed or any of its subsidiaries or affiliates.