Hallucinations: Types, Causes & Diagnosis
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What causes hallucinations? 19 possible conditions

Hallucinations are sensations that appear real but are created by your mind. They can affect all five of your senses. For example, you might hear a voice that no one else in the room can hear or see an image that is not real. These symptoms may be caused by... Read more

See a list of possible causes in order from the most common to the least.

1

Psychosis

Psychosis is a serious mental disorder characterized by thinking and emotions that indicate that the person experiencing them has lost contact with reality.

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2

Schizophrenia Overview

Schizophrenia is the common term for a group of serious psychiatric conditions called the schizophrenic disorders, which are generally characterized by hallucinations and delusions. Auditory hallucinations (hearin...

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3

What is Alzheimer's Disease?

Alzheimer's disease (AD), the most common cause of dementia, is a progressive brain disorder. Learn about the causes, signs and research being done about AD.

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4

Dementia Overview

Dementia may affect memory, thinking, language, judgment, and behavior. Mental impairment must affect at least two brain functions to be considered dementia.

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5

Alcohol Withdrawal Delirium

This condition is considered a medical emergency. Urgent care may be required.

Alcohol withdrawal delirium (AWD) is the most serious form of alcohol withdrawal. It causes sudden and severe problems in your brain and nervous system. Approximately five percent of hospital patients being treated fo...

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6

Low Blood Sodium (Hyponatremia)

Low blood sodium, or hyponatremia, occurs when water and sodium are out of balance in your body. A quick drop in sodium levels can cause weakness, headache, nausea, and muscle cramps.

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7

Epilepsy Overview

Epilepsy is a neurological condition caused by malfunctioning brain cells that result in seizures. There is no cure for this disorder but episodes can become less frequent.

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8

Narcolepsy

Narcolepsy is a disorder of the nervous system that causes drowsiness and sleep attacks. Read more about this disorder.

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9

Migraine with Aura

Migraine is a disorder characterized by repeated attacks of severe headache. Symptoms include throbbing or pulsating pain, usually on only one side of the head, and can last between four hours and three days.

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10

Caffeine Overdose

The recommended amount of caffeine is usually 400 mg per day for healthy adults. Caffeine overdose may occur if you ingest more than this amount.

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11

Marijuana Dependence

Marijuana is the most commonly used illicit drug in the United States. Uncontrollable or overly frequent marijuana consumption may indicate abuse or addiction.

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12

Low Blood Sugar (Hypoglycemia)

This condition is considered a medical emergency. Urgent care may be required.

Also known as hypoglycemia, low blood sugar can be a dangerous condition. Hypoglycemia is rare in people who are not suffering from diabetes, the chronic disease that affects the body's ability to regulate blood sugar...

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13

Cryptococcal Meningitis

Cryptococcal meningitis is a fungal infection and inflammation of the membranes covering your spinal cord and brain.

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14

Wernicke-Korsakoff Syndrome

Wernicke-Korsakoff syndrome is a brain disorder caused by a lack of vitamin B-1. The syndrome is two separate conditions that can occur at the same time.

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15

Partial Seizures

The human brain works by sending electrical signals through neurons, which are nerve cells. A seizure occurs when there's a surge in this electrical activity.

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16

Delirium

This condition is considered a medical emergency. Urgent care may be required.

Delirium is an abrupt change in the brain that causes mental confusion and emotional disruption. It makes it difficult to think, remember, sleep, pay attention, and more. You might experience the condition durin...

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17

Primary Cerebral Lymphoma

Primary cerebral lymphoma is also known as brain lymphoma or central nervous system lymphoma. The brain and spinal cord make up the central nervous system. Cells called lymphocytes are part of the lymph system and ca...

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18

Creutzfeldt-Jakob Disease and Mad Cow Disease

Creutzfeldt-Jakob disease is an infectious disease that causes the brain to degenerate. Learn about causes, symptoms, and its connection to "mad cow disease."

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19

Schizoaffective Disorder

Schizoaffective disorder is a psychological condition that comprises both psychosis (loss of contact with reality) and mood disorders (such as mania or depression). It is divided into two subtypes based on the type o...

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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