What could cause a head to feel foggy and dizzy simultaneously?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Foggy head and dizziness often occur together when the body's balance system, circulation, or brain function is disrupted. Common causes include postural orthostatic tachycardia syndrome (POTS), concussion, vestibular migraine, inner ear disorders, dehydration, low blood sugar, anxiety, and medication side effects. These symptoms may appear suddenly or develop gradually, and they can range from mildly disruptive to severely limiting daily activities.

Because brain fog and dizziness can stem from so many different conditions—some benign and some requiring prompt medical attention—identifying the underlying cause is essential for effective treatment. Rather than guessing or waiting to see if symptoms resolve on their own, take a free, instant, online symptom check to receive personalized insights into possible causes and clear guidance on your next steps. It only takes a few minutes and could help you get answers faster.

Reviewed for medical accuracy: 07/15/2026

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Explanation

There are several reasons why you might feel both foggy and dizzy at the same time. One possibility is a condition called postural tachycardia syndrome. In some people, changes in blood flow and how the body controls its automatic functions can make the brain feel foggy and cause dizziness. Drinking water sometimes helps because it can improve blood circulation. Another possible cause is a concussion or mild brain injury. A concussion can affect different parts of the brain, leading to a feeling of fogginess along with dizziness as the brain works to recover. Vestibular migraine is another condition where the balance centers in the inner ear are affected, which might make you feel dizzy and mentally unclear during an episode. Each scenario involves different parts of the brain and nervous system, showing that even though the sensation of fogginess and dizziness seems similar, it may be due to different underlying causes. If these symptoms persist or worsen, you can check your symptoms to better understand what might be causing them and whether you should talk to a healthcare provider for more information.

(References)

Rodriguez B, Hochstrasser A, Eugster PJ, Grouzmann E, Müri RM, Z'Graggen WJ. Brain fog in neuropathic postural tachycardia syndrome may be associated with autonomic hyperarousal and improves after water drinking. Front Neurosci. 2022 Aug 5;16:968725. doi: 10.3389/fnins.2022.968725. Erratum in: Front Neurosci. 2023 Mar 14;17:1178850. doi: 10.3389/fnins.2023.1178850. PMID: 35992935; PMCID: PMC9388780.
Danielli E, Simard N, DeMatteo CA, Kumbhare D, Ulmer S, Noseworthy MD. A review of brain regions and associated post-concussion symptoms. Front Neurol. 2023 Aug 3;14:1136367. doi: 10.3389/fneur.2023.1136367. PMID: 37602240; PMCID: PMC10435092.
Beh SC, Abouzari M, Bassett AM, Buskirk J, Ceriani CEJ, Crowson MG, Djalilian H, Goebel JA, Kuhn JJ, Luebke AE, Mandalà M, Nowaczewska M, Spare N, Teggi R, Versino M, Yuan H, Zaleski-King A, Teixido M, Godley F. Care Gaps and Recommendations in Vestibular Migraine: An Expert Panel Summit. Front Neurol. 2022 Jan 3;12:812678. doi: 10.3389/fneur.2021.812678. PMID: 35046886; PMCID: PMC8762211.

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