Brain Fog
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Reviewed By:

Bret Mobley, MD, MS

Bret Mobley, MD, MS (Neuropathology)

Dr. Mobley graduated from the University of Michigan Medical School, completing a masters degree in neuroscience between his second and third years of medical school. He trained as a resident in pathology at Stanford University Hospital before joining the faculty of Vanderbilt University Medical Center in Nashville Tennessee in 2010. He was promoted to Associate Professor in 2018 and to Neuropathology Division Director in 2020.

Shohei Harase, MD

Shohei Harase, MD (Neurology)

Dr. Harase spent his junior and senior high school years in Finland and the U.S. After graduating from the University of Washington (Bachelor of Science, Molecular and Cellular Biology), he worked for Apple Japan Inc. before entering the University of the Ryukyus School of Medicine. He completed his residency at Okinawa Prefectural Chubu Hospital, where he received the Best Resident Award in 2016 and 2017. In 2021, he joined the Department of Cerebrovascular Medicine at the National Cerebral and Cardiovascular Center, specializing in hyperacute stroke.

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Content updated on Apr 4, 2024

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With an easy 3-min questionnaire , Ubie's AI-powered system will generate a free report on possible causes.

Questions are customized to your situation and symptoms, including the following personal information:

  • Biological Sex - helps us provide relevant suggestions for male vs. female conditions.

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  • History - considers past illnesses, surgeries, family history, and lifestyle choices.

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✔︎  When to see a doctor

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People with similar symptoms also use Ubie's symptom checker to find possible causes

  • My brain is not working properly

  • My brain is not working

  • Loss of consciousness

  • Losing consciousness

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About the Symptom

A disorder of consciousness, also known as "impaired consciousness", is when a person's ability to be awake and aware is impaired. After brain injury, a patient may recover consciousness completely or may not recover completely. If the patient does not recover completely and has problems with being awake and aware, this is considered a "disorder of consciousness".

When to see a doctor

Seek professional care if you experience any of the following symptoms

  • Brain not functioning / Brain fog

Possible Causes

Generally, Brain fog can be related to:

  • Acute Disseminated Encephalomyelitis

    Acute disseminated encephalomyelitis involves widespread inflammation of the brain and spinal cord, resulting in damage to nerve fibers and their protective linings. It is a result of inflammation that occurs after after an infection or immunization. While it can affect anyone it is more common in children.

  • Hydrocephalus

    Hydrocephalus refers to the abnormal flow of a naturally-occuring brain fluid (cerebrospinal fluid, or CSF) within natural brain cavities (ventricles), causing fluid buildup. This leads to swelling of the ventricles and increased pressure in the brain, which, if untreated, can cause brain damage in pressurized brain regions. Hydrocephalus is most common in infants and older adults. It has a number of causes, including certain genetic conditions, birth defects of the brain, as well as tumors, stroke, head trauma, or brain infections (such as meningitis). In many cases, the exact cause of hydrocephalus cannot be identified.

Related serious diseases

Sometimes, Brain fog may be related to these serious diseases:

Doctor's Diagnostic Questions

Your doctor may ask these questions to check for this symptom:

  • Do you struggle to focus or feel less aware of your surroundings?

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Find Similar Symptoms

Similar symptoms or complaints

Reviewed By:

Bret Mobley, MD, MS

Bret Mobley, MD, MS (Neuropathology)

Dr. Mobley graduated from the University of Michigan Medical School, completing a masters degree in neuroscience between his second and third years of medical school. He trained as a resident in pathology at Stanford University Hospital before joining the faculty of Vanderbilt University Medical Center in Nashville Tennessee in 2010. He was promoted to Associate Professor in 2018 and to Neuropathology Division Director in 2020.

Shohei Harase, MD

Shohei Harase, MD (Neurology)

Dr. Harase spent his junior and senior high school years in Finland and the U.S. After graduating from the University of Washington (Bachelor of Science, Molecular and Cellular Biology), he worked for Apple Japan Inc. before entering the University of the Ryukyus School of Medicine. He completed his residency at Okinawa Prefectural Chubu Hospital, where he received the Best Resident Award in 2016 and 2017. In 2021, he joined the Department of Cerebrovascular Medicine at the National Cerebral and Cardiovascular Center, specializing in hyperacute stroke.

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