Brain fog,” also known as “mental fog,” “reduced awareness,” or “cognitive impairment,” is an informal term for a range of cognitive symptoms, including: functional medicine thyroid doctors

Decreased mental clarity and cognitive function
Difficulty concentrating and multitasking
Loss of short-term and long-term memory
Slow thinking

Because these symptoms are generally subjective, doctors may consider them too mild or nonspecific to diagnose cognitive impairment.

brain fog

There are many possible causes of "brain fog," but some scientists believe that almost all inflammation and free radicals originate in the limbic system, the brain region responsible for emotional, cognitive, and executive functions. I think it does damage.

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Factors Causing Brain Fog
Factors and conditions that can cause "brain fog" include:

Anxiety and stress
Sleeping disorder
Hormonal imbalance
Drugs and drugs conditions such as multiple sclerosis, lupus, and fibromyalgia


Does hypothyroidism trigger brain fog?

People with undiagnosed or undertreated hypothyroidism often complain of forgetfulness, difficulty finding the right words, and lack of attention. But does this mean hypothyroidism triggers "brain fog"? 

In any case, keep in mind that the relationships between different types of hypothyroidism and symptoms of brain fog have been studied primarily in cohort studies. These studies can tie the condition to specific symptoms, but cannot pinpoint the cause of those symptoms.

"Brain fog" is an informal term for a constellation of symptoms that include decreased mental clarity, memory problems, difficulty concentrating, slow thinking, and fatigue. It can be caused by many things, including anxiety, certain medications, and autoimmune diseases.

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Overt hypothyroidism

The condition is associated with several "brain fog" symptoms, especially in older adults, according to six observational studies involving more than 200 people. However, some studies have also reported the following issues:

General Intelligence
Ability to learn
Visual-spatial skills
Symptoms can generally be reversed with thyroid replacement therapy, even in the most severe cases.


However, in some individuals, cognitive symptoms may persist. For example, a study of over 100 people found that they had memory and attention deficits even after 5.5 years of this therapy.

Untreated hypothyroidism can lead to dementia in adults and irreversible brain damage in children with congenital hypothyroidism.

Overt hypothyroidism is associated with "brain fog" symptoms in the elderly. Thyroid replacement therapy generally reversed cognitive symptoms


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Subclinical hypothyroidism

Cases of subclinical hypothyroidism are more controversial and less conclusive. The most common symptom is memory loss, with some studies reporting sluggish thinking, decreased alertness, and fatigue.

A meta-analysis found insufficient or weak evidence linking subclinical hypothyroidism with cognitive impairment. In general, the most severe cases (those with the highest TSH levels) were most likely to develop symptoms.

Subclinical hypothyroidism rarely requires treatment. In the most severe cases, thyroid hormone replacement can improve symptoms.

Researchers disagree about whether subclinical hypothyroidism can cause "brain fog" symptoms.

Hashimoto’s encephalopathy

Hashimoto's thyroiditis is an autoimmune disease in which the immune system produces antibodies that target and progressively damage the thyroid gland. This causes hypothyroidism, manifesting itself as "brain fog."


Or there is a rare type of autoimmune brain disease that causes stroke-like attacks or damages the brain over time. Although its association with Hashimoto's thyroiditis remains unclear, the condition is called Hashimoto's encephalopathy because it is also associated with high levels of antibodies to the thyroid gland.

In addition to seizures, psychosis, and behavioral changes, Hashimoto's encephalopathy can cause progressive "brain fog" symptoms such as:

Slow thinking
Difficulty concentrating
Executive dysfunction
Disorientation and confusion
Speech impediment

Brain imaging studies of people with this condition show mixed results. Some brains were normal in appearance; others showed changes in white matter, reduced blood supply, swelling, and damage.

Some scientists believe that thyroid antibodies can damage the brain (including myelin) or cause inflammation in blood vessels in the brain.

Hashimoto's thyroiditis can cause "brain fog" symptoms. If left untreated, this condition can lead to sluggish thinking, difficulty concentrating, memory loss, and speech problems.

Resistance to thyroid hormone

Thyroid hormone resistance is a condition in which TSH levels remain elevated despite normal to elevated thyroid hormone levels. This condition is due to mutations in thyroid hormone receptors.

Although "brain fog" usually doesn't present itself, many people have ADHD or a below-average IQ, so thyroid replacement therapy can help.

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Hypothyroidism and Health Risks

Several studies have linked hypothyroidism with the increased prevalence of certain diseases. Keep in mind, however, that just because hypothyroidism is associated with a disease doesn't necessarily mean that everyone with hypothyroidism actually develops the disease! Environmental factors can influence risk.

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