Written by Dr. Valentina Quintana MD on
January 14, 2022
Reading Time: 7 minutes

Medically Reviewed by our Medical Affairs Team

Written by Dr. Valentina Quintana MD on:

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Brain fog can affect many people’s brain functions, and it is important to know the symptoms of brain fog.

Brain fog symptoms are not always easy to identify, so taking a brain fog test may help you get an accurate diagnosis.

A test for brain fog will evaluate your brain function by measuring things like concentration levels, memory loss, and mood changes in order to determine if someone has a brain disorder or just a foggy brain.

This post discusses how a brain fog evaluation works and what you should expect when going through this process.

So, let’s get started.

What exactly is brain fog?

Brain fog is a term used to describe feeling mentally cloudy, groggy, or unfocused.

People who experience brain fog often complain of problems with memory, concentration, and thinking clearly.

Brain fog can be caused by many things such as stress, lack of sleep, anxiety, depression, medication side effects, various health conditions like brain tumors, brain infections (e.g., meningitis), brain injuries, brain trauma, and more.

Brain fog is not a specific medical condition like anemia or cancer; therefore, doctors generally diagnose brain fog based on symptoms reported by patients.

The process of diagnosing brain fog depends upon several factors such as the patient’s history, physical examination, brain imaging test results, and other tests that are conducted.

The brain fog evaluation will help the doctor determine if someone has brain damage or a brain tumor due to brain injury or some other medical condition.

It is essential for people who experience brain fog to know more about this disorder so they can discuss it with their doctors when they go for a brain fog test.

What to Expect from a Brain Fog Test

When you go for a brain fog evaluation, the doctor will ask you questions about your symptoms and how long you have been experiencing them.

You may also be asked to complete some tests that will help measure your brain function.

The doctor may use brain imaging tests like magnetic resonance imaging (MRI), computerized tomography (CT) scan, or other brain scans to evaluate your brain.

The doctor may also conduct blood tests and psychological evaluations in addition to the brain fog test.

Blood tests will help determine if an infection is causing brain damage, while a psychological evaluation can be used to detect brain disorders like anxiety, depression, or schizophrenia.

Brain Fog Evaluation

A brain fog evaluation can be conducted in one of two ways:

A brain fog evaluation is a multi-step process that takes a considerable amount of time.

The brain fog test will help determine the cause of brain damage and how severe it is before referring you to an appropriate specialist who can diagnose your condition further based on brain imaging results, blood tests, psychological evaluations, and other tests.

The brain fog evaluation may include:

  • A detailed patient history
  • Physical examination
  • Detailed neurological examination
  • Brain imaging tests (e.g., MRI, CT Scan)
  • Blood tests
  • Psychological evaluation by a psychiatrist or psychologist 
  • Other tests as needed

The brain fog evaluation can be expensive, depending on the tests that are conducted. However, most health insurance plans will cover a brain fog test if it is medically necessary.

What are the benefits of taking a test for brain fog?

If you are experiencing brain fog and have not consulted your doctor to confirm the cause, it is extremely important that you consider taking a brain fog test.

Taking this evaluation will help determine if there’s an underlying medical condition causing brain damage or brain tumors, in addition to helping you get an accurate diagnosis so proper treatment can be provided.

A test for brain fog will also tell you if your brain damage is due to conditions like an infection, medication side effects, or some other medical condition.

For example, patients with brain tumors may lose mental functions and experience changes in thinking abilities as well as physical symptoms such as headaches, seizures, vision problems (e.g., blurred vision), or hearing loss.

On the other hand, brain damage caused by conditions like an infection will not cause brain tumors.

Therefore, brain fog evaluation may show abnormalities on brain imaging tests and blood test results that can help confirm a diagnosis of brain damage due to illness.

The main benefit of taking a test for brain fog is that it will shed light on the brain damage that you are experiencing and help determine whether brain tumors, brain infections, brain injury, or another medical condition is causing brain fog.

Obtaining an accurate diagnosis through a brain fog test is crucial for people who want to manage their symptoms properly so that they can live healthy lives free of memory loss, delusions (e.g., hallucinations), brain fog, confusion, or other cognitive impairments.

When brain damage is suspected, a brain fog evaluation will help you identify the underlying cause of brain injuries that are affecting your thinking abilities.

For example, if brain tumors in the hippocampus (e.g., pituitary gland tumor) or temporal lobe are causing brain fog, it’s possible to receive treatment such as surgery and brain radiation to help control brain damage and reduce symptoms.

In the case of an infection, brain fog evaluation will identify whether or not antibiotics can be used in addition to other treatments that are designed for brain infections like Lyme disease (e.g., bacteria transmitted through a tick bite).

So, if you have been experiencing memory loss, confusion, brain fog, or other cognitive impairments for more than several days and are worried about brain damage – take a test for brain fog.

Common Causes of Brain Fog

Brain fog can be caused by many different things such as:

Poor Nutrition

Having little essential nutrients in your diet can lead to brain fog. This is because a lack of crucial nutrients can affect brain function and cognitive performance.

Some people who are deficient in zinc, magnesium, iron, or vitamin B12 may experience brain fog.

In addition, eating unhealthy foods high in sugar and saturated fats can also lead to brain fog. 

Sleep Deprivation

When you don’t get enough sleep, your brain fog will increase. This happens because not getting the recommended amount of sleep (i.e., seven to eight hours per night) can lead to decreased cognitive performance and impairments in memory, judgment, and decision-making skills.

Chronic Stress 

Chronic stress also causes brain fog. This is because chronic stress can cause the brain to release high levels of cortisol, which limits brain function and cognitive performance.

Furthermore, when you are constantly worried about something or have a lot on your mind (e.g., financial difficulties), it makes it difficult for you to concentrate or focus on the tasks that you need to complete.

Hormone Imbalances

Hormonal imbalances can also cause brain fog. This is because brain function and cognitive performance are closely connected to hormone levels in the brain (e.g., serotonin, dopamine).

When these hormones aren’t functioning normally, it’s common for people to experience symptoms of brain fog like memory loss, confusion, or difficulty concentrating on tasks that need to be completed.

Mental Illness and Diseases

Some brain fog symptoms result from mental disorders or diseases such as: 


Seizures are brain disorders that cause involuntary movements and a change in mental state.

When brain fog occurs, it’s called an absence seizure or petit mal seizure. These types of brain damage can lead to memory loss, confusion, and forgetfulness with no warning signs before they occur.


Schizophrenia is a brain disorder that causes hallucinations and delusions. These symptoms are usually not noticed by others, but they can be real to the person who has them.

In addition, brain fog caused by schizophrenia may cause many different types of brain damage, including:

  • Memory loss
  • Confusion
  • Forgetfulness
  • Difficulty concentrating

Alzheimer’s Disease

This brain disorder is the most common type of dementia. Alzheimer’s disease causes a progressive decline in mental abilities and memory. In addition, this brain damage can lead to constant brain fog and changes in mood and behavior.

Parkinson’s Disease

This brain disorder affects movement and leads to problems with balance, coordination, and slowness of movement.

In addition, brain fog is common in people who have Parkinson’s disease. This type of brain damage can lead to changes in mood and behavior as well as difficulties with thinking, reasoning, and problem-solving skills.

Brain Tumors

Brain tumors are abnormalities that are caused by brain cells growing abnormally, which affect the brain’s ability to function.

In addition, brain fog caused by brain tumors may cause changes in mood or behavior as well as memory loss, confusion, irritability, reduced attention span, inability to make decisions (e.g., poor judgment), difficulty concentrating on tasks (e.g., poor focus), and slowed thinking.


Some medications can also cause brain fog. This is because some medicines can affect brain function and cognitive performance.

For example, anti-seizure medications (e.g., carbamazepine) and antibiotics (e.g., ciprofloxacin) can cause brain fog in some people.

In addition, other medications have side effects that can lead to brain fog, such as:

In addition, antipsychotic medication side effects can also cause brain fog.

Treatment for Brain Fog

If brain fog is caused by a brain disorder or disease, then it’s important to treat the cause.

For example, if brain fog is caused by chronic stress, you need to talk with your doctor about treatments that could help reduce your levels of stress, such as medication and cognitive-behavioral therapy (CBT).

Also, brain fog caused by medications can be treated with other medicines that produce fewer side effects or a change in medication. 

If brain fog is not caused by a brain disorder or disease, then there are some things that you can do to help reduce your symptoms.

Tips to Reduce Brain Fog Symptoms

Here are some tips that may help to reduce brain fog symptoms:

  • Make a list of the tasks that need to be done and try to organize them by priority.
  • Break down complex tasks into smaller, more manageable tasks.
  • Take breaks often and allow yourself time to rest.
  • Try to exercise regularly as this can help improve brain function.
  • Eat a healthy diet and avoid foods that may make your brain fog worse (e.g., processed foods, sugary drinks, caffeine).
  • Reduce your stress levels as much as possible.
  • Get enough sleep (at least seven or eight hours per night). 

Remember that if your brain fog is caused by a brain disorder or disease, then you should talk with your doctor about treatments that could help reduce brain fog symptoms while treating the root cause.

Concluding Thoughts

A test for brain fog is something that can help you understand your brain better, especially if brain fog is a genuine concern.

If brain function has been declining over time or becomes significantly worse, then it’s essential to talk with your doctor about brain fog evaluation so that they can determine the cause of brain fog and recommend treatments that could alleviate symptoms while treating the underlying condition.

If brain fog is caused by a brain disease, then it’s important to treat the root cause and not just brain fog symptoms. This can be done through medications or surgery.

Also, if your brain health declines over time due to advancing age or other factors such as chronic stress, then you may want to consider brain fog testing to understand how brain function is changing and what you can do to reduce the effects of brain fog.

The bottom line is that a brain fog test can provide a lot of information about your brain health and help you take steps to improve cognitive function if needed.

If you want to learn more about brain fog and overall brain health, check out these educational articles and feel free to join this online community of mental health enthusiasts and professionals.

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