Why Do People Breathe Into Paper Bags When They Hyperventilate?

People who panic or hyperventilate (i.e., breathe too rapidly) are often told to breathe into paper bags because it can help them adjust their pH balance by slightly increasing the level of carbon dioxide in their blood.

You have likely seen in movies or TV shows that when people (often nerds) get panic attacks or suddenly feel very anxious or frightened for no particular reason, they take a paper bag and begin breathing into it.

In fact, sometimes people actively recommend breathing into a paper bag to recover from a panic attack. Have you ever thought why? Is there a specific reason behind it or is this just another ‘thing’ that people do when they hyperventilate?

What is a panic attack?

A panic attack strikes patients suddenly, accompanied by a feeling of intense terror and a fear of imminent danger. In most cases of panic attacks, there’s no particular, specific reason. However, research has shown that in many cases, panic attacks don’t result from anxiety and fear, but rather from abnormal breathing.

Although some of the commonly observed symptoms of a panic attack include a rapidly pounding heart, chest pain, dizziness etc. (which usually subside in less than 10 minutes), the one symptom that you find in (almost) every single case of a panic attack is shortness of breath, which further leads to hyperventilation (i.e., the state of breathing faster/deeper than necessary).

, Why Do People Breathe Into Paper Bags When They Hyperventilate?, Science ABC, Science ABC

(Photo Credit : Pixabay)

Hyperventilation syndrome

A sudden shortness of breath (which occurs for no apparent reason) is one surefire sign of a panic attack. This condition of breathing too rapidly or too deeply is referred to as hyperventilation syndrome (HVS) in medical terms.

Also referred to as dysfunctional breathing hyperventilation syndrome or chronic hyperventilation syndrome, it is commonly characterized by chest pain, tightness in the chest and a tingling sensation around the mouth and fingertips.

What happens to body pH when you hyperventilate?

It typically happens like this: when people suffer from a panic attack, they have difficulty breathing and thus feel short of breath. As a result, they start hyperventilating, or in other words, breathe more rapidly and deeply than necessary. When this happens, the levels of carbon dioxide in the body take a hit, which is not a good thing.

You see, when we breathe, we basically inhale oxygen and exhale carbon dioxide. Oxygen, as you likely already know, is a primary ingredient required by our body’s cells to work and produce energy (cellular respiration). After we inhale oxygen, it’s transported to different organs by the blood that courses throughout the body.

Blood vessels in the human bod

Oxygen and carbon dioxide are transported all over the body through our blood.(Photo Credit : clker.com)

However, just like oxygen, carbon dioxide is also important for a number of bodily functions. When combined with water, carbon dioxide forms carbonic acid in the body, which is used to (quickly) adjust and maintain body pH. For an average, healthy adult, the body pH is around 7.4, i.e., slightly on the alkaline side.

When carbon dioxide levels drop below a certain threshold in the body, two things happen. First, most of your blood vessels narrow, which restricts the supply of blood to the extremities of the body. Second, low carbon dioxide means the blood pH will shift towards the basic side, which means that hemoglobin (a protein present in the blood) holds onto oxygen more readily. Consequently, the oxygen supply to tissues is further restricted.

Why are people told to breathe into a paper bag when they panic or hyperventilate?

When you hyperventilate, your body is basically attempting to get as much oxygen as possible. However, in the process, you end up shedding carbon dioxide at an increased rate, which, as we discussed above, is not a good thing for your body.

That’s why people often tell you to breathe into a paper bag. The idea is to breathe in the same air you exhaled, because it has a higher concentration of carbon dioxide (because you exhale carbon dioxide-rich air).

Does breathing into a paper bag do any good?

Well, that depends. In theory, increasing carbon dioxide levels in the body by rebreathing your exhaled carbon dioxide from a paper bag does make sense. That being said, it’s not a reliable solution, which is why doctors don’t recommend it. There are a few reasons behind this.

For one, the aforementioned mechanism of how breathing into a paper bag helps doesn’t explain every case of hyperventilation syndrome. Furthermore, there are many things that can cause hyperventilation in an individual, including a heart attack or an asthma attack. Breathing into a paper bag to treat these types of cases of hyperventilation can be counter-productive, and may even be fatal to the individual.

Heart attack

A heart attack can also trigger hyperventilation.(Photo Credit : Lisa F. Young / Shutterstock)

In summary, while the strategy makes sense, it could be really dangerous to breathe into a paper bag without knowing the exact cause of a particular hyperventilation episode.


  1. Columbia University Medical Center
  2. University of Maryland Medical Center
  3. Asbury University
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About the Author

Ashish is a Science graduate (Bachelor of Science) from Punjabi University (India). He spends a lot of time watching movies, and an awful lot more time discussing them. He likes Harry Potter and the Avengers, and obsesses over how thoroughly Science dictates every aspect of life… in this universe, at least.

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