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Do I Have ‘Brain Fog’?

A neurologist breaks down when to seek treatment.

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Practice Focus Areas

This medical professional has a particular interest or expertise in:

Education

Medical Education:: MD, Rosalind Franklin University of Medicine and Science Chicago Medical School - 2015
Internship:: Louis A Weiss Memorial Hospital - 2016
Residency:: McGaw Medical Center of Northwestern University - 2019
Fellowships:: McGaw Medical Center of Northwestern University

Board Certifications

American Board of Psychiatry and Neurology/Neurology - Neurology (Certified)

Faculty Profile

Assistant Professor, Feinberg School of Medicine

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Practice Groups and Affiliations

Medical Group:: Northwestern Medical Group
Alignment Category:: Northwestern Medicine Physician Network
On Medical Staff At:: Catherine Gratz Griffin Lake Forest Hospital

Northwestern Memorial Hospital

Ratings and Reviews

At Northwestern Medicine, our patient’s feedback is important to us. While different care providers have their own unique strengths, we strive to be as transparent as possible with our quality of care.

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Overall Rating

4.7

4.7

579 Ratings

Reviews from Patients

58 Reviews

Reviews from Patients

58 Reviews

February 11, 2026

5.0

Paid full attention to patient

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February 11, 2026

5.0

Great listener and feedback that addresses the topics/issues at hand. Always attentive to patient and patient's concerns and thoughts. Has great knowledge and understanding of patient's neurological needs as well as making the patient

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February 09, 2026

5.0

Dr. Cahan was very thorough and knowledgeable. He listened to all my concerns and incorporated them into his explanation during the evaluation. He was very kind and patient _humanizing a very scary topic for me in a way I could understand.

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February 06, 2026

5.0

He is thorough. And looks out for the best interest of the patient.

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February 03, 2026

5.0

He is very thorough and professional. Takes time to explain the situation and options.

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February 02, 2026

5.0

Great doctor!

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January 19, 2026

5.0

Very thorough. Took time. Explained everything well

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January 09, 2026

5.0

He is thorough very knowledgeable and helpful to explain

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January 07, 2026

5.0

Patient care is excellent. Always available to answer questions

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January 05, 2026

5.0

Dr. Cahan was extremely thorough, knowledgeable and professional.

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December 18, 2025

5.0

Extremely knowledgeable. Easy to talk to.

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December 15, 2025

5.0

He's knowledgeable. Easy to talk to.

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December 11, 2025

5.0

Dr Cahan is compassionate and invested in finding the reasons for my decline. He is kind and engaged. Highly trust him with my care

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December 09, 2025

5.0

I like him, my wife likes him. He is very aware of the questions I ask.

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December 08, 2025

5.0

He did a fine job

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December 07, 2025

5.0

Courteous. Patient. Explained difficult subject well.

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December 07, 2025

5.0

Dr. Josh Cahan was knowledgeable, patient, and detailed in his explanations, and personable too.

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December 02, 2025

5.0

Develops an empathetic and caring doctor-patient relationship.

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December 02, 2025

5.0

In addition to being very knowledgeable, he is very caring.

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October 27, 2025

5.0

Joshua Cahan listened to my questions and was very thorough.

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October 23, 2025

5.0

He listens to me and addresses my problem

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October 22, 2025

5.0

He's top-notch. Thorough and kind. And he takes the time to explain the results and answer our questions.

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October 13, 2025

5.0

Like his demeanor and bedside manner, relatable, approachable...

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October 08, 2025

5.0

Very patient, excellent listener

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September 29, 2025

5.0

Dr. Cahan has always made us very comfortable with professionalism, medical care, knowledge, and treatment. Then he opens up and allows us to be personal and family oriented.

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September 27, 2025

5.0

Though it took 7 months to get the appointment, Dr. Cahan was thoughtful, explanatory and friendly in explaining the testing and procedures to discovering snd treating my symptoms.

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September 22, 2025

5.0

He understands what is happening and has good suggestions on how to resolve the situation.

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September 11, 2025

5.0

On top of things,always

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September 03, 2025

5.0

Excellent Care

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August 27, 2025

5.0

Share information, including risks, side effects and respects my personal situation.

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August 21, 2025

5.0

good communication; understands illness; logical treatment plan

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August 19, 2025

5.0

Wonderful guy.

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August 06, 2025

5.0

Open, informative and frank, yet always considerate and respectful. You know that he's listening when speaking with him.

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August 05, 2025

5.0

He is so kind and puts me at ease. Incredibly competent and knowledgeable. I know I am in good hands

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August 02, 2025

5.0

He is the best in the field of neurological medice. My husband has improved and continue to make great progress because of the treatment he has received from him.

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July 30, 2025

5.0

Very thoughtful and caring doctor

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July 28, 2025

5.0

Efficient and caring.

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July 27, 2025

5.0

explained things well

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July 22, 2025

5.0

Good demeanor, good communicator

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July 21, 2025

5.0

Doctor is experienced and shows compassion to his patients.

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July 20, 2025

5.0

Great physician

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July 17, 2025

5.0

He has an efficient, yet not rushed manner. I always feel like he is being honest, frank and respectful.

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July 08, 2025

5.0

He was friendly, explained everything thoroughly, and made me feel comfortable. Never felt rushed.

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July 07, 2025

5.0

Kind, caring, informative.

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July 03, 2025

4.0

Some may be reluctant to travel to chicago as we did. We live in nw Indiana. I will be sure to tell them I really liked him!

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July 02, 2025

5.0

Pleasant and Productive

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June 28, 2025

5.0

Dr. Cahan is easy to understand, kind, and patient.

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June 27, 2025

5.0

Very encouraging!

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June 27, 2025

5.0

Dr. Cahan is a very kind doctor. He listens carefully to our needs and always makes great suggestions for medical and personal needs.

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June 22, 2025

5.0

Dr. Cahan listens and observes carefully. He put my husband at ease about his condition and prospects.

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June 09, 2025

5.0

Great doctor! He makes me feel comfortable and gives me options to review.

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June 03, 2025

5.0

Caring and professional

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June 02, 2025

5.0

Dr Cahan was very personable and focused on my needs as a patient. I trust the recommendations he made and feel he gave me advice that was based on his best understanding of my situation.

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May 23, 2025

4.0

Good listener and answers all your questions

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May 20, 2025

5.0

His work ethics and concerns for his patients.

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May 15, 2025

5.0

Very professional, kind and we didn't feel rushed

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May 15, 2025

5.0

He was caring and very thorough always explaining and patient.

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May 05, 2025

5.0

Dr Cahan has a reassuring and calming manner. He takes time to explain, welcomes questions, and listens to my concerns. I trust him.

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Disclosures

Industry Relationships

Consulting

Faculty member and/or their immediate family have engaged in activities such as speaking, advising, consulting, or providing educational programs for the following companies or other entities

AbelsonTaylor, Inc.
Atheneum
Fieldwork Chicago-Schaumburg
Guidepoint Global, LLC
Pri-Med USA

Faculty member received compensation for medical record consultation and/or expert witness testimony.

External Professional Relationships

Pharmaceutical, device, and biotechnology companies frequently collaborate with basic scientists and physicians within an academic medical center to help advance science and improve patient care. These relationships are important in achieving scientific breakthroughs and in establishing the effectiveness and safety of promising new therapies. In order to assure objectivity in clinical research and patient care, the Northwestern University Feinberg School of Medicine (Feinberg), Northwestern Memorial HealthCare, Children's Hospital of Chicago Medical Center, and the Shirley Ryan AbilityLab have adopted integrity policies that require research and clinical faculty (in full-time, part-time, and unpaid/voluntary categories) to report compensated and uncompensated external industry relationships. Patients are encouraged to discuss these disclosures with their physician as well as to inquire as to how these relationships are overseen by Feinberg. To learn more about our Disclosure and Professional Integrity Policy, and the conflict of interest policies of our joint affiliate survey partners, please go to our Office for Regulatory Affairs Policies page.

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HealthBeat

Do I Have ‘Brain Fog’?

A neurologist breaks down when to seek treatment.

More HealthBeat Articles