Unusual or Strange Behavior: Effects, Diagnosis & Treatments
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What causes personality change? 17 possible conditions

Unusual or strange behavior is behavior that is not appropriate to the circumstances. It occurs when a person is unnaturally moody, aggressive, euphoric, or mild-tempered. Fluctuations in mood from time to time are normal. However, unusual reactions to... Read more

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

1

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. Read about signs and treatment.

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2

Head Injury

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

A head injury is an injury to your brain, skull, or scalp. All head injuries should be treated seriously and assessed by a doctor.

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3

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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4

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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5

Stroke Overview

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

A stroke (a "brain attack") is a medical emergency in which part of the brain is deprived of oxygen. This occurs when an artery that supplies oxygenated blood to the brain becomes damaged and brain cells begin to die.

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6

Adult Brain Tumor

A brain tumor is the growth of abnormal cells in your brain. Whether the growth is cancerous or not, any brain tumor is serious. Symptoms can include both cognitive and physical control problems.

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7

Creutzfeldt-Jakob Disease and Mad Cow Disease

Creutzfeldt-Jakob disease is an infectious disease that causes the brain to degenerate. The hallmark of this brain disease is an inability to think clearly and take care of oneself.

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8

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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9

Pituitary Cancer

The pituitary gland is a very small gland of major importance to the functioning of the human body. It is located directly behind the eyes and below the front of the brain. It is about the size of a pea. Despite it...

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10

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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11

Central Sleep Apnea

Central sleep apnea is a sleep disorder in which you briefly stop breathing during sleep. The moments of apnea can occur repeatedly throughout the night. The interruption of your breathing happens may indicate a proble...

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12

Huntington's Disease

Huntington's disease is a hereditary condition in which your brain's nerve cells gradually break down. It can cause physical and psychological symptoms.

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13

Porphyrias

Porphyrias are rare types of genetic blood disorders in which patients have a defect in heme production, an important part of hemoglobin. Blisters are a sign of porphyria cutanea tarda, the most common type of porphyria.

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14

Post Concussion Syndrome

Post-concussion syndrome, or post-concussive syndrome (PCS), refers to the lingering symptoms following a concussion or a mild traumatic brain injury. Symptoms vary but include headache, dizziness, and depression.

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15

Pernicious Anemia

Pernicious anemia occurs when your body can't absorb enough vitamin B-12 to function properly. Learn about the signs and symptoms of pernicious anemia.

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16

Hyperparathyroidism

Hyperparathyroidism is a condition where the parathyroid glands produce too much parathyroid hormone (PTH).

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17

Brain Tumor

A brain tumor is a collection or mass of abnormal cells in your brain. A brain tumor can be cancerous (malignant) or non-cancerous (benign).

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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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