Brain fog
Brain fog is a type of transient cognitive dysfunction that comprises a constellation of symptoms that impair intellectual functioning to a level that interferes with daily activities, commonly including forgetfulness, mental slowness, difficulty thinking or focusing, a perceived slowing of mental processing speed, inability to find the right words, a sensation that the mind went blank or is "cloudy". Brain fog tends to recur and may be triggered by factors such as physical fatigue, lack of sleep, and prolonged standing or may appear to occur spontaneously.
Also called: Mental clouding, Mental fatigue, Mental fog.
Conditions associated with brain fog
The following conditions have been associated with brain fog in medical literature. This is informational and not a diagnosis.
Chronic Fatigue Syndrome
A disorder characterized by profound fatigue that does not improve with rest and is worsened by physical or me...
Fibromyalgia
A chronic disorder characterized by widespread musculoskeletal pain, fatigue, and sleep, memory, and mood dist...
Secondary hypoparathyroidism due to impaired parathormon secretion
Secondary hypoparathyroidism due to impaired parathormon secretion is a medical condition that may be associat...
Visual snow syndrome
Visual snow syndrome is a medical condition that may be associated with various symptoms and signs....
Tests providers may use to investigate brain fog
When investigating brain fog, a healthcare provider may order one or more of the following laboratory tests. Test selection is a clinical decision made by a qualified professional.
Amino Acids Urine Test
This urine test panel can help discover deficiencies in amino acids. It is used for diagnosis and monitoring o...
CBC with Differential
Measures red blood cells, white blood cells, and platelets to help evaluate overall health and detect disorder...
Comprehensive Metabolic Panel (CMP)
Measures 14 substances in the blood to assess kidney and liver function, electrolyte balance, and blood sugar ...
Sedimentation Rate (ESR)
Measures inflammation by timing how fast red blood cells settle....
Thyroid Stimulating Hormone (TSH)
Screens for thyroid disorders such as hypothyroidism and hyperthyroidism....
Urinalysis
Examines urine content to help detect urinary tract infections, kidney disease, and diabetes....
Vitamin D, 25-Hydroxy
Measures vitamin D levels to detect deficiency or insufficiency....
Symptoms commonly seen alongside brain fog
Morning Stiffness
Joint or body stiffness that is worst in the morning and improves with movement, which can be a sign of inflam...
Muscle Pain
Pain in the muscles, which can be caused by overuse, infection, or inflammatory conditions....
Sleep Disturbances
Disruptions to normal sleep, which can be related to stress, illness, or hormonal changes....
Unrefreshing Sleep
Sleep that does not leave you feeling rested, which can be a sign of sleep disorders or chronic fatigue syndro...
Widespread Body Pain
Pain on both sides of the body, above and below the waist, which is characteristic of fibromyalgia....
Worsening Symptoms After Activity
Symptoms that worsen after physical or mental activity, characteristic of chronic fatigue syndrome....
When to seek care
Seek care from a qualified healthcare provider if brain fog is severe, persistent, worsening, or accompanied by concerning symptoms. If you think you have a medical emergency, call your local emergency number immediately.
Frequently Asked Questions
What does the symptom brain fog mean?
Brain fog is a health sign or symptom described in medical literature. Brain fog is a type of transient cognitive dysfunction that comprises a constellation of symptoms that impair intellectual functioning to a level that interferes with daily activities, commonly including forgetfulness, mental slowness, difficulty thinking or focusing, a perceived slowing of mental processing speed, inability to find the right words, a sensation that the mind went blank or is "cloudy". Brain fog tends to recur and may be triggered by factors such as physical fatigue, lack of sleep, and prolonged standing or may appear to occur spontaneously.
Which conditions are associated with brain fog?
Brain fog has been reported in association with 4 conditions in the medical literature we index, including Chronic Fatigue Syndrome, Fibromyalgia, Secondary hypoparathyroidism due to impaired parathormon secretion, Visual snow syndrome. These associations do not mean you have any of these conditions.
Should I see a doctor about brain fog?
You should discuss any persistent or concerning symptoms with a qualified healthcare provider. This website does not provide diagnosis. If you have severe symptoms or signs of a medical emergency, seek care immediately.