Brain Fog

What is Brain Fog?

Brain fog is a popular term for a group of thinking problems, including poor concentration, forgetfulness and slowed thinking, that make the mind feel clouded. It is not a formal diagnosis. It shows up in many conditions, including long COVID, cancer treatment, menopause and thyroid disease.^{[1, 2, 3]}

Common symptoms

People describe difficulty focusing, forgetting words or recent events, slow thinking and mental tiredness even after rest. In long COVID and after chemotherapy, brain fog has been linked in studies to lower scores on cognitive tests, along with more fatigue and more depressive symptoms.^[1]

Brain fog is a different problem from dementia, but it can be worrying. Midlife women often ask whether their changes signal a serious cognitive disorder, and a clinician can help sort this out.^[2]

Causes and risk factors

Brain fog has many possible causes, and often more than one applies at once. Reviews describe it after COVID-19, with inflammation, immune responses and blood vessel changes proposed as mechanisms.^[4] A meta-analysis of studies found cognitive impairment in about 22 percent of people 12 or more weeks after COVID-19.^[5]

Cancer treatment can cause cancer-related cognitive impairment, with memory loss, poor concentration and word-finding trouble. Emotional distress also contributes.^[6] Menopause can bring cognitive changes, and some people treated with levothyroxine for hypothyroidism report persistent brain fog.^{[2, 3]} Poor sleep is also linked to cognitive problems.^[7]

How it is diagnosed and treated conventionally

There is no single test for brain fog. A physician looks for the underlying cause through a history, examination and, where needed, blood tests and cognitive screening such as the Montreal Cognitive Assessment.^[4]

Treatment depends on the cause. For hypothyroid-related brain fog, reviewers recommend individualized plans that combine thyroid care, general medical care and psychosocial support, and they describe cognitive rehabilitation as underused.^[3] In a living systematic review of long COVID trials, moderate-certainty evidence suggested that an online cognitive behavioral therapy program probably improved concentration.^[8]

Why Brain Fog calls for a whole-person approach

Brain fog rarely has one cause, so looking at only one factor can miss the others. Sleep, stress, mood, hormones, illness and medicines can all affect thinking, and they influence one another.

For that reason, care that supports sleep, stress and energy is a reasonable addition to the medical search for a cause. It is a supportive step, not a substitute for finding out why the fog is there.

Sleep

Poor sleep is closely tied to how clearly people think. In a meta-analysis of 76 cohort studies, insomnia, short sleep, poor sleep quality and daytime sleepiness were each associated with a higher risk of later cognitive decline or dementia.^[7]

Stress and the prefrontal cortex

Stress can impair the brain's planning and attention areas. Laboratory and human research reviewed in one paper describes how uncontrollable stress weakens prefrontal networks, and that chronic stress can lead to lasting loss of their function.^[9]

Mood and fatigue

Foggy thinking often travels with low mood and exhaustion. In long COVID and chemotherapy studies, people with brain fog had more fatigue and more depressive symptoms than people without it.^[1]

Hormones and thyroid function

Hormonal change is a recognized contributor. Cognitive changes occur in the menopause transition, and thyroid disease can be linked to brain fog.^{[2, 3]}

Acupuncture for Brain Fog

What the research shows

No trials were found that test acupuncture for brain fog as a general problem, so the evidence comes from specific groups of people with cognitive complaints. It is limited and mostly low certainty.

The best-studied group is cancer survivors. A 2026 meta-analysis of 44 trials with 3,783 adults found that acupuncture improved scores on two cognitive screening tests compared with usual care and with sham acupuncture. It found no benefit on a patient-reported cognition questionnaire, and the authors rated the certainty of the evidence as low to very low.^[10]

A small pilot trial in 32 cancer survivors compared real acupuncture, sham acupuncture and a waitlist. Perceived cognition improved more with real acupuncture, but the trial was designed to test feasibility and the sham group also improved.^[11] In a trial of cancer survivors with insomnia, acupuncture was followed by improvements in measured attention, learning and memory, and both acupuncture and cognitive behavioral therapy for insomnia were followed by better self-rated thinking. The differences between the two groups were not statistically significant.^[12]

Sleep may be one route. In a meta-analysis of 15 trials in insomnia, acupuncture improved sleep quality scores compared with medication, with benefit appearing after about three weeks, though results varied widely between trials.^[13] For long COVID, we found only study protocols and opinion papers on acupuncture, not trial results.

How acupuncture may work

How acupuncture might help foggy thinking is not established. In the cancer survivor trial, those whose insomnia improved with acupuncture also showed greater improvement in self-rated thinking, which suggests better sleep may be one route.^[12] This is a preliminary finding from one group of patients, not a proven mechanism.

What treatment involves

Treatment uses fine, sterile, single-use needles at points on the body, usually left in place for about 20 to 40 minutes. The cancer survivor pilot gave weekly sessions over 10 weeks, and the insomnia trial gave treatment over 8 weeks.^{[11, 12]} We reassess after a short course of visits.

Serious problems are rare. In prospective studies, about 9 in 100 patients had a minor reaction such as brief bleeding, soreness or redness at a needle site, and serious events occurred in about 1 in 10,000 patients.^[14] Tell the practitioner first if you have a bleeding disorder, take blood thinners, are pregnant, or have a pacemaker (relevant to electroacupuncture).

Ayurvedic medicine for Brain Fog

The Ayurvedic view

Ayurveda has no condition that matches brain fog exactly. Cloudy thinking and poor memory are traditionally linked to weakened medha (intellect and retention) and to imbalances such as aggravated Vata or Pitta, or a heavy, dull Kapha state, sometimes with poorly digested material called ama. These are traditional frameworks, not biomedical diagnoses.

Therapies that may be used

Care is chosen for the individual and traditionally combines:

• Regular sleep and meal times and a calm daily routine
• Breathing practices, meditation and gentle yoga
• Herbs traditionally used for the mind, such as brahmi (Bacopa monnieri) and ashwagandha (Withania somnifera), prescribed individually by a practitioner
• Warm oil massage and forehead oil treatments (Shirodhara)

Panchakarma is not appropriate during pregnancy, acute illness or frailty, and is not a first step for unexplained cognitive change.

What the research shows

There is no direct evidence. No trials of Ayurvedic treatment for brain fog were found. Research on individual herbs comes from other groups of people.

A meta-analysis of nine placebo-controlled trials with 518 people found that a standardized extract of Bacopa monnieri taken for at least 12 weeks shortened reaction times on some attention tests. The trials were not in people with brain fog, so the result does not show it would help brain fog.^[15] A meta-analysis of 12 trials found ashwagandha reduced anxiety and stress compared with placebo, but with low-certainty evidence and large differences between trials.^[16] Stress relief could matter for foggy thinking, though that link was not tested in these studies.

Herbal medicine for Brain Fog

Herbs and formulas that have been studied

Chinese herbal formulas have been tested in post-COVID syndrome, and Bacopa and ashwagandha, described above, have been studied for cognition and stress. Formulas are chosen by pattern, such as deficiency of qi or blood, or stagnation, and are prescribed individually.

What the research shows

There are no trials of herbs for brain fog itself. A 2025 meta-analysis of 10 trials with 2,401 patients found that Chinese herbal medicine did not significantly lower overall symptom scores in post-COVID syndrome. It did improve chest tightness and insomnia, and fatigue showed only a non-significant trend. The authors called for cautious interpretation because results differed widely between trials.^[17]

For cancer-related cognitive problems, a narrative review mentions a Chinese herbal medicine among possible treatments but does not offer trial evidence we can report.^[6]

Safety and herb-drug interactions

Herbs are active substances and can interact with medicines. Reported interactions include bleeding when ginkgo was combined with warfarin or aspirin, and serotonin syndrome when St John's wort was combined with certain antidepressants.^[18] Because many people with brain fog take antidepressants, thyroid medicine or blood thinners, every herb needs a review against your medicine list.

Herbal and dietary supplements account for a notable share of drug-induced liver injury in the United States, and the ingredient responsible is often unknown.^[19] In one study, about one fifth of Ayurvedic medicines bought online contained detectable lead, mercury or arsenic.^[20] Tell us if you are pregnant or breastfeeding or have liver or kidney disease.

Translating traditional medicine into modern biological language

The links drawn here are interpretation, not equivalence. Chinese medicine may describe foggy thinking as clouded orifices of the mind, often with qi deficiency, spleen deficiency or phlegm. Researchers study things that loosely parallel these ideas: sleep quality, stress-related changes in the prefrontal cortex, inflammation and fatigue.^{[1, 9]}

Ayurveda's description of dull or unsteady medha loosely parallels attention and memory complaints, and its emphasis on routine parallels sleep and stress care.^[7] No study has shown that a dosha or a TCM pattern corresponds to a specific biological process.

How this care fits with your medical care

Integrative care for brain fog is complementary. Brain fog needs a medical look for causes such as thyroid disease, sleep disorders, depression, medicine side effects and anemia. We do not diagnose the cause, so keep your physician involved and do not stop or change prescribed medicines without your prescriber.

Please bring your diagnosis, recent test results, a full list of medicines and supplements, and any cancer treatment or COVID-19 history. Tell your physician that you are receiving complementary care.

When to seek urgent medical care

New or fast-changing confusion can signal a serious problem and should be assessed right away.

• Sudden confusion, trouble speaking or understanding, or a drooping face
• Sudden severe headache or vision loss
• Weakness or numbness on one side of the body
• Fever with stiff neck or marked drowsiness
• Thoughts of harming yourself (call or text 988, the Suicide and Crisis Lifeline)
• Fast-worsening memory loss or getting lost in familiar places

If any of these occur, call 911 or go to the nearest emergency department.