Why do comas exist?

Comas exist as a critical medical state of prolonged unconsciousness, not a planned event, arising from severe brain dysfunction due to injury (trauma, stroke, lack of oxygen), illness (infections like meningitis, diabetes extremes, tumors, seizures), or toxins/drugs, essentially shutting down the brain's ability to be awake and aware, acting as a severe "disorder of consciousness" where the body functions but the brain can't process the world.

Is a coma the closest thing to death?

Brain death is not the same as coma

Brain death differs from other states of unconsciousness in important ways. For example, coma is similar to deep sleep, except that no amount of external stimuli can prompt the brain to become awake and alert. However, the person is alive and recovery is possible.

What are the main causes of a coma?

Common causes of coma include:

• Anoxic brain injury.
• Cerebral infarction.
• Cerebral hemorrhage. Spontaneous. Traumatic.
• Cerebral neoplasms.
• Hypertensive encephalopathy.
• Hypoglycemia.
• Metabolic encephalopathy.
• Myxedema.

How long can you be in a coma and wake up?

You can wake up from a coma after days, weeks, months, or even years, though most comas resolve within weeks; recovery length varies greatly, depending on the injury's cause and severity, with rare but documented cases of people waking after decades, like Munira Abdulla (27 years) or Terry Wallis (19 years). Most recoveries involve gradual consciousness return, while longer unconsciousness often transitions to vegetative or minimally conscious states, with outcomes highly unpredictable. 

How long will comas last?

A coma's duration varies widely, from a few days to months or even years, but typically lasts a few weeks, depending heavily on the cause and severity of the brain injury; some patients recover fully, others transition to vegetative or minimally conscious states, while some may not wake up, highlighting the unpredictable nature of recovery. 

What Happens in the Brain During a Coma?

Do you dream in a coma?

Yes, many people in comas, especially those emerging from them or in medically induced states, report vivid, dream-like experiences or hallucinations, though they aren't typical dreams as they lack normal sleep cycles and can blend with reality, often incorporating hospital surroundings, medications, or sensory input like ice packs. While a true, deep coma usually prevents normal dreaming, the brain can create intense internal worlds, sometimes as nightmares or elaborate narratives, as it tries to process stimuli or heal.
 

What's the shortest a coma can be?

A coma can be very short, lasting just minutes or hours, especially for milder brain injuries or when medically induced for a brief period, but most naturally occurring comas last days to a few weeks, with outcomes depending heavily on the cause and severity of brain damage. While some come out quickly, others progress to vegetative states or have lasting disabilities, making duration highly variable, though longer than a few weeks is less common for recovery, according to this Headway article and this Synapse article. 

Can a person hear in a coma?

Yes, people in a coma can often hear, even if they can't respond, with studies showing brain activity when familiar voices are present, and some patients later recall hearing loved ones, suggesting that talking to them is beneficial and can aid recovery, as familiar sounds stimulate the brain. Hearing and comprehension are different, but auditory pathways often remain active, and familiar voices, music, or stories played to patients have been linked to faster healing and improved outcomes, making it important for families to communicate. 

What is the longest coma ever survived?

The longest coma survived is held by Edwarda O'Bara, who remained in a diabetic coma for about 42 years, from January 1970 until her death in November 2012, making her the longest-surviving coma patient on record according to Guinness World Records. She fell into the coma at age 16 after contracting pneumonia, and her family provided constant care, with her mother caring for her until her own death six years prior.
 

What are the odds of surviving a coma?

Coma survival rates vary widely, heavily depending on the cause (e.g., head injury, stroke, poisoning) and initial severity (Glasgow Coma Scale - GCS). While overall survival can be poor (around 20-40% in some severe cases), with many patients dying or remaining vegetative, good outcomes (moderate to good recovery) are possible, especially with higher initial GCS scores (8+) or certain causes like metabolic issues. Factors like age, pupillary response, and early GCS trends significantly influence prognosis, with severe early signs often predicting worse outcomes. 

Is being in a coma like sleeping?

No, being in a coma isn't like normal sleeping; while a person in a coma looks like they're deeply asleep, they are in a prolonged state of unconsciousness, unable to wake up or respond to stimuli, including pain, and their brain activity is significantly different, lacking the regular cycles of sleep. A coma involves a serious brain issue, unlike sleep, where the brain cycles through stages, processes information, and dreams, whereas a comatose brain has reduced activity and doesn't experience normal sleep patterns.
 

Is coma a cause of death?

Yes, you can die in a coma, as it's a severe medical state with outcomes ranging from recovery to permanent vegetative states or death, often due to complications like infections, blood clots, or the underlying cause (like severe oxygen deprivation or stroke) leading to brain death, which is the irreversible cessation of all brain function.
 

How does being in a coma feel?

Being in a coma feels like being in a state of deep, dreamless sleep with no awareness of your surroundings, often described as darkness or being "blackout drunk," but some patients might experience flashes of sensation or even residual awareness, though typically without conscious processing, while others report confusion or fragmented memories upon waking. The key is unconsciousness—no response to pain, sound, or touch—but brain activity can vary, with some showing signs of internal experience. 

Is the brain alive in a coma?

Someone who's in a coma is unconscious and has minimal brain activity. They're alive, but cannot be woken up and show no signs of being aware.

Is someone in a coma in pain?

People in a coma are completely unresponsive. They do not move, do not react to light or sound and cannot feel pain.

Do people slip into a coma before death?

Yes, many people enter a deep, unconscious, or coma-like state as they approach death, often sleeping for long periods and becoming unresponsive to voices or touch, though they may still hear and feel comforting presence, as hearing is often the last sense to fade. This deep sleep or unresponsive state is a natural part of the dying process, sometimes interspersed with periods of confusion, restlessness, or even hallucinations, before slipping into permanent unconsciousness.
 

Can a coma be reversed?

Yes, a coma can be reversible, especially if the underlying cause is identified and treated quickly, with outcomes ranging from full recovery to permanent disability or even death, depending on the cause, severity, and duration, as some causes like low blood sugar are easily fixed while severe brain trauma is less so. Recovery is often gradual, and many people transition from coma to other states like minimally conscious states, with many regaining full awareness over time, though comas rarely last more than a few weeks. 

Has anyone woken up from a coma after years?

Annie Shapiro (1913–2003) was a Canadian apron shop owner who was in a coma for 29 years because of a massive stroke and suddenly awakened in 1992.

What are the chances of waking up from a coma?

Chances of waking from a coma vary greatly, depending on the cause (traumatic vs. non-traumatic), severity (Glasgow Coma Scale score), age, and time since injury, with younger people and those with traumatic injury often having better odds, but roughly 30-50% see good recovery, while many face death or long-term disability, especially after several weeks, as most people transition out of coma within a month. 

Can someone in a coma cry?

Yes, people in a coma or similar states (like vegetative or minimally conscious states) can sometimes cry, laugh, or make facial expressions, but these are often reflexive, automatic responses from lower brain centers, not necessarily a sign of conscious emotional understanding or voluntary action, though they can be distressing for family. While a person in a deep coma is unresponsive, these reflex-like emotional expressions can occur as the brain slowly begins to show reactions, sometimes in minimally conscious states where some awareness might be present.
 

What does it feel like to be unconscious?

Being unconscious feels like nothing at all – a complete blankness, like a gap in memory where you lose awareness of time, self, and surroundings, similar to a very deep, dreamless sleep, with no thoughts or perception, and no memory of the event itself. You're simply not there, and coming out of it involves a disorienting transition, often with confusion or fogginess, but the state itself is an absence of feeling or experience, according to accounts from Quora and Reddit users. 

Do people in Comas know what's happening around them?

Yes, people in comas can often hear and process what's happening, even if they can't respond; recent studies show 1 in 4 may have hidden awareness (cognitive-motor dissociation), responding mentally to commands like imagining tennis, while brain scans reveal familiar voices light up their brains, suggesting they perceive loved ones and benefit from hearing them speak, though memory afterward varies. 

Is a coma like a long sleep?

Coma is a state of consciousness that is similar to deep sleep, except no amount of external stimuli (such as sounds or sensations) can prompt the brain to become awake and alert. A coma is a medical emergency.

Can the brain heal itself after lack of oxygen?

The brain has a limited ability to "heal" after oxygen deprivation (hypoxic-anoxic injury); while it can't regenerate dead brain cells, it can recover lost functions through neuroplasticity and intensive rehabilitation (physical, speech, cognitive therapy), with outcomes depending heavily on the duration of oxygen loss, though severe or prolonged deprivation often causes permanent damage, leading to lifelong impairments or vegetative states. 

What's longer than a coma?

A vegetative state (VS) or post-coma unresponsiveness (PCU) is a disorder of consciousness in which patients with severe brain damage are in a state of partial arousal rather than true awareness. After four weeks in a vegetative state, the patient is classified as being in a persistent vegetative state (PVS).