Ever walked into a room and forgotten why you were there? Or struggled to focus despite getting through your to-do list? Many people describe this feeling as "brain fog". While the term has become increasingly common, doctors say it is not actually a medical condition.
According to Dr. Girishkumar Soni, Consultant Neurologist, Lilavati Hospital & Research Centre, Mumbai, brain fog is a symptom that can have several underlying causes, ranging from everyday lifestyle habits to neurological and medical conditions. The key, he says, is not to dismiss persistent symptoms or assume they are simply part of a busy life.
What is brain fog?
Patients often describe brain fog in different ways. Some complain of forgetfulness, while others say they struggle to concentrate, multitask or think clearly. Many simply describe it as having a "cloudy" brain.
Dr. Soni explains that brain fog is not a disease in itself. Instead, it is a collection of cognitive symptoms that may include poor attention and focus, slow thinking, forgetfulness, mental fatigue and difficulty processing information.
"As neurologists, we see brain fog as a symptom rather than as a disorder itself," he says.
What causes brain fog?
According to the neurologist, the reason is often linked to lifestyle. Lack of sleep, long working hours, stress, anxiety, depression, unhealthy eating habits, dehydration, a sedentary lifestyle and excessive screen time can all contribute to brain fog.
"In today's demanding work environment, many young people accept these symptoms as normal, when they may actually be a sign of an exhausted brain," Dr. Soni says.
However, he stresses that lifestyle is only part of the picture. Medical causes should always be considered before brushing brain fog aside.
The specialist says brain fog can be an early sign of vitamin B12 deficiency, thyroid disorders, iron deficiency, uncontrolled diabetes, chronic kidney or liver failure, autoimmune diseases, endocrine disorders and even the side effects of certain medicines. Persistent cognitive symptoms following viral infections, including COVID-19, have also received growing attention in recent years.
From a neurological perspective, brain fog has also been observed in people living with migraine, epilepsy, multiple sclerosis, sleep disorders, brain injuries and, in some cases, the early stages of neurodegenerative diseases.
Dr. Soni also highlights an important distinction. "Brain fog does not equal dementia." He explains that people with brain fog are usually aware that their thinking and memory have become affected, whereas those with dementia gradually lose the ability to function independently.
How is brain fog treated?
Rather than focusing only on the symptom, doctors first look for the underlying cause.
Dr. Soni says a detailed medical history often provides valuable clues. Sleep quality, mood, medications, existing health conditions and a neurological examination all help guide further evaluation. Brain imaging, he adds, is recommended only when the clinical picture indicates it is necessary.
He also points out that several simple lifestyle measures can support brain health. These include getting seven to eight hours of sleep each night, staying physically active, eating a balanced diet rich in fruits, vegetables, nuts, whole grains and healthy fats, drinking enough water, reducing stress and keeping the mind active through reading and social interaction.
Good control of conditions such as high blood pressure and diabetes is equally important for maintaining brain health, he adds.
When should you see a doctor?
Dr. Soni advises seeking medical attention if brain fog becomes persistent or progressively worsens, especially if it is accompanied by weakness, balance problems, difficulty speaking, vision changes, severe headaches, seizures or behavioural changes.
"Brain fog is not a disease, however, it should not be ignored," he says. "In most cases, it is a sign that something, whether it relates to lifestyle or illness, is affecting your brain and preventing it from functioning properly."
The neurologist emphasises that brain health underpins everything from memory and decision-making to productivity and independent living. Paying attention to these warning signs, he says, is one of the most important steps people can take to protect their long-term brain health.
Disclaimer: Tips and suggestions mentioned in the article are for general information purposes only and should not be construed as professional medical advice.
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