Why Do We Get Brain Freeze? (The REAL Reason)

Brain freeze, known in the medical community as Sphenopalatine Ganglioneuralgia, is a common dull ache or pain that occurs in the brain after eating cold foods. Although brief, this type of headache can be very comfortable. Who wants to feel pain while eating ice cream? 

How Does Brain Freeze Work? 

Brain freeze is a response to cold temperatures rapidly entering the mouth. When blood vessels and nerves in that area are aware of that drop, they respond accordingly. The response leads to pain in the front of the head, similar to a migraine. 

Let’s go into further detail, but note that there isn’t one single theory as to why we get brain freeze. Multiple theories point to a certain nerve and a blood vessel that cause brain freeze, but which one is involved, or whether they work with each other, is not known for certain. 

We know that the body is responding to the cold sensations in our mouth, but the exact response, and what part of the body is responsible, is not known for certain.

Identifying The Cold 

The body has certain expectations for how it functions. It should be working at certain temperatures, calmly, expelling certain amounts of energy, throughout the day. When things fall outside those expectations, the body automatically responds so that it can adjust back to normal without harm. Various studies in psychology and biology look at how the brain and body work together to handle threats and maintain a state of homeostasis (balance.)

Unfortunately, these functions weren’t designed with ice cream in mind. The temperature of the ice cream is a little too cold for the mouth to handle. (Think about it. Cavemen weren’t going around eating ice!) A rapid drop in temperature that doesn’t involve ice cream would likely signal an unusual danger. We can’t reassure our mouths and brains that we are safe eating ice cream, so the body responds as it would to any other bizarre and rapid drop in temperature.

Communication with Trigeminal Nerve 

How does the body respond? First, the information about the dropped temperatures must be communicated to the brain. Many experts believe that the trigeminal nerve is responsible for sending this message. The triggering of this nerve is the central action that leads to brain freeze. 

The trigeminal nerve runs from the face up to the brain and communicates sensory information. Usually, when this nerve is triggered, it’s bad news. The body responds in a way that is painful. So some experts believe that once the trigeminal nerve is triggered by cold foods or drinks in the mouth, it sends information in a way that is misinterpreted. Like it would any other time the trigeminal nerve is triggered, the body responds and we feel that aching pain at the top of our head. 

Communication With Blood Vessels 

This isn’t the only theory about why we experience brain freeze. Other experts have a theory that blood vessels, rather than the trigeminal nerve, are the culprit. 

When the body communicates to the brain that temperatures have dropped around the face, the blood vessels constrict and send more blood to the vital organs. Cold temperatures cause the blood vessels to constrict whether you’re experiencing the temperature inside your mouth or on the tips of your toes. With more blood closest to the vital organs, the brain and other areas are less likely to freeze and the body is more likely to survive. That’s why your fingers and toes get cold first! 

Some experts believe that the anterior cerebral artery, part of the internal carotid artery, is the blood vessel that most likely starts the pesky process that leads to brain freeze. This artery runs past the back of the throat and supplies oxygenated blood to the front parts of the brain. And while some parts of this artery will constrict, other parts (nearest to the vital organ otherwise known as the “brain”) will expand. The extra pressure on the brain bumps up against pain nerves, and we experience pain

Why Do Only Some People Get Brain Freeze? 

The jury is still out on what exactly causes brain freeze. But do scientists know why only some people get brain freeze? Not really. The answer here is totally unclear, but through research and experiments, it may be revealed soon!  

Is Brain Freeze Dangerous?

No, brain freeze is not dangerous. The pain that we feel when we experience brain freeze is only temporary and causes no permanent damage to the brain, nerves, and blood vessels involved. It’s just an annoying sensation that only some people experience!

No need to tell your doctor if you experience brain freeze or not. If you experience migraines, however, you should reach out to a medical professional for help. 

Brain Freeze and Migraines 

Experts have not yet determined the exact cause of brain freeze, but they do know that there is a connection between brain freeze and migraines. Studies show that people who have a history of migraines are more likely to experience brain freeze than people who don’t. What does this mean for how brain freezes work? We’re still not sure.

How to Avoid Brain Freeze

There is no surefire way to avoid brain freeze if you are eating especially cold foods. Even in cold weather, the presence of ice cream or other cold foods in your mouth may lead to a brain freeze. The only way to avoid it is to avoid these foods altogether – but who would want to stop eating ice cream or popsicles? 

How to Stop Brain Freeze 

Even though brain freeze lasts for 20-30 seconds, you may find yourself wanting to get rid of the sensation immediately. You can do this by “reassuring” the nerves and sensory receptors at the roof of your mouth that your temperature is normal. Stick your tongue or even your thumb up to the roof of your mouth, and your brain will feel back to normal soon. 

Brain freeze is a pretty crazy phenomenon, and like many phenomena, we don’t have all the answers yet. If you have more pressing questions on brain freeze, you may just be the person who should be in charge of answering them for yourself and the rest of the world!

Theodore Thudium

Theodore is a professional psychology educator with over 10 years of experience creating educational content on the internet. PracticalPsychology started as a helpful collection of psychological articles to help other students, which has expanded to a Youtube channel with over 2,000,000 subscribers and an online website with 500+ posts.