Alteration in consciousness | Symptom Checker
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What causes alteration in consciousness? 50 possible conditions

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

1

Consciousness Decreased

Decreased consciousness can affect your ability to remain awake, aware, and oriented. Learn about the symptoms that can be a sign of decreased consciousness.

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2

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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3

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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4

Sepsis

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

One life-threatening complication of infection is sepsis, which often occurs in people who are elderly or have weak immune systems. Patches of discolored skin is a symptom of severe sepsis.

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5

Organic Brain Syndrome

Learn about the symptoms, causes, risk factors, and treatment for neurocognitive disorders (formerly called organic brain syndrome).

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6

Subarachnoid hemorrhage

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

Subarachnoid hemorrhage (SAH) refers to bleeding within the subarachnoid space, which is the area between your brain and the tissues that cover it.

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7

Meningococcemia

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

Meningococcemia is a bacterial infection that can lead to meningitis. Learn more about the symptoms.

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8

Brain Aneurysm

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

An aneurysm in the brain is a weak area in an artery in the brain that bulges out and fills with blood. It can be unpredictable and life-threatening, and can cause extremely serious conditions.

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9

Intracerebral Hemorrhage

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

Intracerebral hemorrhage (ICH) is when blood suddenly bursts into brain tissue, causing damage to the brain. Symptoms usually appear suddenly during ICH.

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10

Dissection of the Aorta

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

The aorta is a large artery that carries blood out of your heart. If you experience a dissection of the aorta, it means that blood has entered the wall of the artery, between the inner and middle layers. This can happe...

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11

Seizures

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

Seizures are changes in the brain's electrical activity. This change can cause dramatic, noticeable symptoms or it may not cause any symptoms. The symptoms of a severe seizure include violent shaking and a loss o...

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12

Low Blood Sugar (Hypoglycemia)

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

Hypoglycemia, or low blood sugar, is a potentially dangerous condition that's most common in people with diabetes. Learn what causes it and how to prevent it.

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13

Meningitis

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

Meningitis can affect you differently depending on your age. Learn more about the symptoms and risk factors for each age group.

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14

Septicemia

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

Septicemia is bacterial infection spread through the entire vascular system of the body. If untreated it can result in sepsis, a life-threatening inflammation.

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15

Parkinson's Disease

Parkinson's disease (PD) is a progressive neurological disorder. It first presents with problems of movement. Smooth and coordinated muscle movements of the body are made possible by a substance in the brain calle...

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16

Ischemic Cardiomyopathy

Ischemic cardiomyopathy (IC) is a condition that occurs when the heart muscle is weakened. It's usually caused by heart attack or coronary artery disease.

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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

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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19

Congestive Heart Failure (CHF)

Congestive heart failure (CHF) is a chronic condition that affects the chambers of your heart. CHF refers to fluid buildup around your heart.

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20

Pulmonary Edema

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

Pulmonary edema is a condition in which the lungs fill with fluid. When this occurs, the body struggles to get enough oxygen, often resulting in breathlessness, coughing, excessive sweating, and bluish skin or lips.

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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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