Most deviated septums have no symptoms. You might not know you have a deviated septum. But sometimes a deviated septum can cause the following:

• Blockage in one or both nostrils. This blockage can make it hard to breathe. This might be worse during colds or allergies that can cause nasal passages to swell and narrow.
• Nosebleeds. The surface of the nasal septum might become dry. This can raise the risk of nosebleeds.
• Noisy breathing during sleep. A deviated septum or swelling of the tissues in the nose can be one of many reasons for noisy breathing during sleep.
• Needing to sleep only on one side. Some people sleep on a certain side to ease breathing through the nose at night if one nasal passage is narrowed.

See a healthcare professional for:

• A blocked nostril that doesn't clear up with treatment.
• Frequent nosebleeds.

A deviated septum is caused by a few conditions. A deviated septum happens when the thin wall that separates the right and left sides of the nose, called the nasal septum, is pushed to one side.

A deviated septum can be caused by:

• A condition present at birth. In some cases, a deviated septum happens when the fetus is in the womb. It can be seen at birth.

• Injury to the nose. A deviated septum can also be the result of an injury that causes the nasal septum to move out of place.

  In infants, such an injury may occur during childbirth. In children and adults, a wide array of accidents may lead to a nose injury and deviated septum. Trauma to the nose most commonly occurs during contact sports, rough play such as wrestling or automobile accidents.

Aging can affect nasal structures. So a deviated septum can get worse over time.

Swelling and irritation of the nasal cavities or sinus cavities from an infection can narrow the nasal passage even more. The result can be nasal blockage.

A deviated septum can have several risk factors. For some people, a deviated septum is present at birth — happening during fetal development or due to injury during childbirth. After birth, a deviated septum is most commonly caused by an injury that moves the nasal septum out of place. Risk factors include:

• Playing contact sports.
• Not wearing a seat belt while riding in a motor vehicle.

A badly deviated septum that blocks the nose can lead to complications such as:

• Dry mouth. This is from breathing through the mouth.
• Disturbed sleep. This is from not being able to breathe well through the nose at night.
• Repeated nosebleeds. Air passing through the nostrils can dry out the surface of the nasal septum.

To help prevent the nose injuries that can cause a deviated septum:

• Wear a helmet or a midface mask when playing contact sports, such as football and volleyball.
• Wear a seat belt when riding in a motor vehicle.

To diagnose a deviated septum, a healthcare professional does a physical exam. An exam involves looking inside the nose using a bright light and sometimes a tool to spread open the nostrils. A long tube-shaped scope with a bright light at the tip can show farther back in the nose, if needed.

You're likely to start by seeing your family healthcare professional. But you might be referred to an ear, nose and throat (ENT) specialist.

Making a list of questions to ask during your appointment and being ready to answer questions can help you make the most of your appointment.

For a deviated septum, some questions your healthcare professional might ask include:

• How long have you had a blocked your nose?
• How often are you aware that it is blocked?
• Is it harder to breathe through one side of the nose than it is the other?
• Is the blockage mild, moderate or severe?
• Have you injured your nose?
• Do you have allergies that affect your nose?
• Have you lost some of your ability to smell?
• Do you have problems with sinusitis?
• Do you have nosebleeds?
• Is there anything that makes the blockage worse?
• Is there anything you do that relieves the symptoms?
• What medicines have you used for this?
• What medicines are you now taking for this?
• Does decongestant spray help?
• Do you use decongestant spray every day?
• Does using a nasal adhesive strip help?
• Is your nasal blockage worse when you are lying down?
• Have you had nasal surgery?

Some questions you might ask include:

• What is likely causing my symptoms or condition?
• What is the best course of action?
• What other actions could I try?
• I have these other health conditions. How can I best manage them together?
• Do I need to restrict activities?
• Should I see a specialist?

Be sure to ask all the questions you have about your condition.