Symptoms A-Z

Amnesia Symptoms, Causes & Common Questions

Understand your amnesia symptoms with Buoy, including 7 causes and common questions concerning your amnesia.

This symptom can also be referred to as: difficulty remembering, memory lapses

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Amnesia Symptoms

You woke up earlier than usual. Today is a big day. You're rushing out the door to an important meeting when suddenly, you feel like you're forgetting something. No matter how hard you try, you just can't remember what it was. Sound familiar? Our memories all go fuzzy from time to time, but when you start to forget more and remember less, amnesia is a possible diagnosis.

There are several kinds of amnesia, all with different causes. The disease does not present itself in the same manner every time. It could either be temporary or permanent and patients may experience partial or total memory loss. Some have trouble remembering the past (retrograde amnesia) [1] while others can't retain new information (anterograde amnesia) [2].

Common characteristics of amnesia

Amnesia symptoms depend on its type and cause, but may include the following:

  • Memory loss
  • Forgetfulness
  • Confusion
  • Not being able to recognize faces and places
  • Inability to process and store new information or memories
  • Generation of false memories
  • After recovery, patients have no memory of their amnesia episode

If being forgetful happens more often than expected, it's time to seek medical help to rule out a serious underlying medical condition. If your episodes are infrequent, there are available treatments and preventative measures you can take to manage amnesia symptoms.

Amnesia Causes

Causes of amnesia can normally be broken down into three main groups — brain related causes, lifestyle causes, and medical conditions.

Brain-related amnesia causes

Direct injury or stress to the brain can result in amnesia.

  • Brain damage: Damage to the brain, especially on the hippocampus, due to an injury can affect memory. This part of the brain can likewise be compromised if there is a lack of oxygen for a prolonged amount of time.
  • Stress or trauma: Whether you experience a physical trauma, injury, or witness a stressful situation, amnesia can set in. This is why some people in car accidents never remember the ordeal [4].

Lifestyle amnesia causes

The following habits can result in amnesia that should resolve once they are addressed.

  • Alcohol: Drinking excessive amounts of alcohol can cause amnesia.
  • Vitamin B12 deficiency: Amnesia can be due to pernicious anemia or lack of vitamin B12. Vitamin B12 helps maintain healthy nerve cells, thus a decrease in its level can cause amnesia [5].

Medical conditions

Medical conditions that may result in amnesia include the following.

  • Hypothyroidism: A less active thyroid gland is said to cause forgetfulness and other memory issues [6].
  • Medications: Common medications given to patients for surgery, like anesthesia, are believed to cause amnesia. Benzodiazepines are also linked to amnesia.

Remember that amnesia is a very broad condition. A few episodes of it could be normal but if it progresses, you should have yourself checked as soon as possible. Try to ask a family member or a friend to record your episodes of forgetfulness. Share this data with your physician. One form of amnesia can be very scary for the person who has no memory of their identity or their surroundings and he or she will need family and friends' support until the temporary illness improves. This is known as transient global amnesia, and has no known cause or cure, but usually resolves within hours. It is important to seek immediate medical attention to rule our more serious causes of global amnesia such as stroke or seizures.

7 Possible Amnesia Conditions

The list below shows results from the use of our quiz by Buoy users who experienced amnesia. This list does not constitute medical advice and may not accurately represent what you have.

Traumatic brain injury

Traumatic brain injury (TBI) happens when a bump, blow, jolt, or other head injury causes damage to the brain.

Rarity: Common

Top Symptoms: new headache, irritability, clear runny nose, vision changes, general numbness

Symptoms that always occur with traumatic brain injury: head injury

Urgency: Emergency medical service

Acute stress disorder

Acute stress disorder (ASD) is a psychological condition caused by trauma, especially by any violent attack such as robbery, assault, or combat. "Acute" means that clear symptoms appear within days of the traumatic event. Most susceptible are those with a previous history o...

Alzheimer's disease

Alzheimer's disease is a progressive neurological disorder that slowly destroys memory and the ability to think clearly. As symptoms worsen, patients are often unable to perform basic tasks.

Rarity: Common

Top Symptoms: trouble sleeping, forgetfulness, anxiety, aggression or confusion, anxiety, irritability, depressed mood

Symptoms that always occur with alzheimer's disease: forgetfulness, anxiety, aggression or confusion

Urgency: Primary care doctor

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Dissociative amnesia

Dissociative amnesia is a condition in which a person becomes unable to remember events from a part of their life. It affects about one percent to three percent of people in the general population and has a few main forms that have different effects. Generally, people with dis...

Wernicke-korsakoff syndrome

Wernicke-Korsakoff Syndrome, or WKS, is a neurologic disorder. The names represent the acute stage of the illness, called Wernicke's Encephalopathy, and the chronic stage, called Korsakoff Syndrome.

WKS is caused by a deficiency of thiamine, or vitamin B1. It is most often seen in alcoholics; anyone who has had a poor diet, eating disorder, or weight-loss surgery; and those with serious illness such as cancer or AIDS.

Acute symptoms are primarily physical and include abnormal, uncoordinated walking and standing; flickering eye movements called nystagmus; and damage to the heart and nervous system. There may also be profound drowsiness that can lead to coma.

Chronic symptoms are primarily mental and include short-term memory loss and dementia-like behavior.

The acute stages of WKS can be a life-threatening medical emergency. Take the patient to the emergency room or call 9-1-1.

Diagnosis is made through physical examination and blood tests.

Treatment involves simply adding thiamine supplements to the diet, as well as treating any remaining symptoms to aid in recovery.

Rarity: Rare

Top Symptoms: nausea or vomiting, leg numbness, feeling confused and not making sense while talking, amnesia, jerky, unsteady, or uncoordinated walk

Urgency: Hospital emergency room

Depersonalization/derealization identity disorder

Depersonalization/derealization identity disorder are two types of dissociative disorders. This means the person's thoughts and feelings become disassociated – or disconnected – from reality.

Depersonalization and derealization are similar and often occur together.

Depersonalization means the person feels no connection to their own thoughts, emotions, or experiences.

Derealization means the person feels that the world around them is unreal, dreamlike, or entirely imaginary.

Anyone can have a dissociative disorder, though it is most common among adolescents who have experienced traumatic events.

Symptoms include a sense of detachment from the self, as though standing aside and watching events happen to someone else; memory loss regarding certain events; and significant depression and anxiety. The symptoms may come and go.

Dissociative disorders can severely affect a person's quality of life and ability of function normally. A medical provider should be seen for referral to the appropriate specialist.

Diagnosis is made through patient history. Tests may be done to rule out any physical condition.

Treatment involves psychotherapy and sometimes medications such as antidepressants or anxiolytics.

Rarity: Rare

Top Symptoms: depersonalization or derealization, derealization, impaired social or occupational functioning, ringing in the ears, amnesia

Symptoms that always occur with depersonalization/derealization identity disorder: depersonalization or derealization

Urgency: Primary care doctor

Viral encephalitis

Encephalitis is irritation and swelling (inflammation) of the brain, most often due to viral infections. Encephalitis caused by the herpes simplex virus is the leading cause. Several other causes of encephalitis (St. Louis, California, Japanese and Eastern Equine encephalitis infections) are transmitted by bites from an infected mosquito.

Rarity: Rare

Top Symptoms: fatigue, being severely ill, loss of appetite, new headache, vomiting

Symptoms that always occur with viral encephalitis: being severely ill

Urgency: Hospital emergency room

Amnesia Treatments and Relief

When to see a doctor for amnesia

If any of the following resonate with your current condition, seek medical attention.

  • Amnesia symptoms after a head injury
  • Severe confusion or disorientation
  • You are unable to recognize close friends and family members
  • You are unable to identify yourself
  • You are unaware of current date or events

Treatments for amnesia

Treatment of amnesia depends on the underlying causes. The following treatments and preventative measures are currently used in the fight against amnesia symptoms.

  • Detoxification: Alcohol induced amnesia can be treated through detoxification. Once alcohol is eliminated in the body, memory issues should subside [7].
  • Meditation: This calming practice can help the nervous system function properly [8].
  • Sleep schedule: Go to bed at the same time and wake up at the same time, making sure you get an adequate eight hours of sleep each night.
  • Occupational therapy: This treatment is suitable for persistent amnesia symptoms. It helps patients learn new things and adjust to a new living style [9].

*Note: Amnesia caused by traumas normally subside over time and without medical intervention. However, in cases of severe injuries, amnesia may be permanent.

Further preventive measures

In order to better prevent episodes of amnesia, keep the following in mind.

  • Avoid alcohol
  • Wear protective gear when suggested
  • Stay mentally and physically active
  • Eat a balanced diet and stay hydrated

We may all experience a bit of forgetfulness here and there. But knowing when memory loss isn't just a funny quirk and when it's a serious sign can ideally prevent amnesia from progressing too quickly.

FAQs About Amnesia

Here are some frequently asked questions about amnesia.

What causes amnesia?

Amnesia caused by many conditions, as memory is a very complex physical process. Generally speaking, amnesia can be caused by lack of blood flow to the brain, which often causes fainting, epileptic seizures which stop the brain from "recording," or psychological disorders in which memories are repressed [10]. It may occur following trauma to a particular area of the brain as well.

Can amnesia be caused by stress?

Psychogenic disorders can cause amnesia. Essentially, a psychogenic disorder is a disorder that is caused by a mental manifestation of stress. Psychogenic symptoms are true experiences they are authentic and often out of the control of the individual experiencing them but they do not have a clear physical cause. Extreme stress can cause psychogenic amnesia. Common examples of other maladies caused by stress include children that cease talking after a significant trauma.

Can amnesia be reversed?

Yes, amnesia can be reversed depending on the underlying diagnosis. In many cases, memory will return spontaneously following a mild concussion or drug-induced memory loss. Other common causes of reversible memory loss include arterial ischemia (or blockage of an artery), venous congestion (inadequate flow through veins), migraines, and epileptic seizures. However, memory loss from dementia is usually irreversible.

What part of the brain is affected by amnesia?

Memory is a complex process, and different types of amnesia originate in different places. The mediobasal temporal lobe and the hippocampus are the most frequently associated structures in relation to amnesia. The hippocampus is primarily the part of the brain that stores memories, though these memories can be stored throughout the higher cortices of the brain (the frontal lobes). We have a hippocampus on both sides of the brain and loss of either will cause memory loss.

How long does amnesia last?

Amnesia may resolve in less than 24 hours or may persist for a lifetime depending on the cause. Temporary and short-lived loss of blood flow, limited epileptic seizures, and psychogenic amnesia tend to be temporary. However, permanent injury to the brain tends to cause amnesia to exist longer or be permanent. If you are suffering from amnesia, the diagnosis and reason why you have amnesia is the most pertinent factor in determining how long the symptoms will last. If the structures that hold memories were permanently shut down, it may be temporary, if they were destroyed, however, it can be much more difficult to develop new memories.

Questions Your Doctor May Ask About Amnesia

To diagnose this condition, your doctor would likely ask the following questions:

  • Are you having any difficulty walking?
  • Are your symptoms causing difficulty at work, socializing, or spending time with friends & family?
  • Do you feel detached or outside of your own body?
  • Are you experiencing a headache?

The above questions are also covered by our A.I. Health Assistant.

If you've answered yes to one or more of these questions

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Amnesia Symptom Checker Statistics

People who have experienced amnesia have also experienced:

  • 8% Fatigue
  • 5% Headache
  • 4% Difficulty Concentrating

People who have experienced amnesia were most often matched with:

  • 53% Traumatic Brain Injury
  • 23% Acute Stress Disorder
  • 23% Alzheimer'S Disease

People who have experienced amnesia had symptoms persist for:

  • 72% Over a month
  • 11% Less than a day
  • 5% Less than a week

Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

Amnesia Symptom Checker

Take a quiz to find out what might be causing your amnesia


  1. Retrograde Amnesia. Elsevier: ScienceDirect. ScienceDirect Link
  2. Anterograde Amnesia. Elsevier: ScienceDirect. ScienceDirect Link
  3. Dissociative Amnesia. Psychology Today. Published June, 2017. Psychology Today Link
  4. Vitamin B12. National Institutes of Health: Office of Dietary Supplements. Published June 24, 2011. ODS Link
  5. The lowdown on Thyroid Slowdown. Harvard Medical School: Harvard Health Publising. Published March, 2014. Harvard Health Publishing
  6. Pappas S. Alcoholics' Brains Recover Quickly After Detox. Live Science. Published October 16, 2012. Live Science Link
  7. Wanucha G. Mindfulness as Medicine. UW Medicine: Memory & Brain Wellness Center. Published February 19, 2016. MBWC Link
  8. Nott MT, Chapparo C, Heard R. Effective Occupational Therapy Intervention with Adults Demonstrating Agitation During Post-Traumatic Amnesia. Brain Injury. 2008;22(9):669-683. Pubmed Link
  9. Janyna MM, Robin H. Untreated hypertension can lead to memory loss by cutting down on blood flow to the brain. Neurology. Published Apr 2005. Neurology Link

Disclaimer: The article does not replace an evaluation by a physician. Information on this page is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.