Anisocoria: Symptoms, Causes, & Treatment
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What causes unequal pupils? 18 possible conditions

Anisocoria is a condition where the pupil of one eye differs in size from the pupil of the other. Your pupil is the black circle in the center of your eye. The pupils of your eyes are usually the same size. Anisocoria has several causes and it is only found... Read more

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

1

Concussion

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

A concussion is a mild traumatic brain injury. Usually it occurs after an impact to your head or after a whiplash-type injury. A concussion can cause many severe symptoms that affect brain function.

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2

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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3

Subdural Hematoma

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

A subdural hematoma occurs when blood collects on your brain's surface beneath the skull. They usually result from a head injury.

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4

Intracranial Hemorrhages

Intracranial hemorrhage (ICH) is bleeding inside the skull. It is a life-threatening emergency. If you think you or someone you know is experiencing ICH, go to the emergency room right away or call 911. There are fou...

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5

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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6

Epidural Hematoma

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

An epidural hematoma occurs when blood fills the area between the skull and the protective covering of the brain. It usually results from a traumatic injury to the head, and puts you at risk for brain damage or death.

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7

Optic Neuritis

The optic nerve carries visual information from your eye to your brain. Optic neuritis (ON) is when your optic nerve becomes inflamed, causing vision loss.

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8

Shaken Baby Syndrome

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

Shaken baby syndrome is caused by forcefully and violently shaking a baby. Learn about shaken baby syndrome symptoms, diagnosis, and treatment.

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9

Skull Fractures

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

A skull fracture is any break in the cranial bone, or the skull. It can result in bleeding, bruising, pain, and swelling. Less severe symptoms include headache, nausea, confusion, and blurred vision.

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10

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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11

Eye Emergencies

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

If you have an injured eye or a foreign object in your eye, you'll likely need to seek medical attention right away. Here's what to look out for in eye emergencies.

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12

Seizures

Seizures are changes in the brain's electrical activity that cause violent shaking and loss of bodily control. Bruises can result from injuries sustained during a seizure.

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13

Brain Aneurysm

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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14

Acoustic Neuroma

An acoustic neuroma is a benign tumor that grows on the nerve that connects your brain and your ear.

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15

Meningitis

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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16

Glaucoma

Glaucoma is an eye condition that damages your optic nerve. Learn what causes it.

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17

Necrotizing Vasculitis

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

Necrotizing vasculitis is the inflammation of blood vessel walls. It can interrupt blood flow, causing skin, muscle, and blood vessel damage.

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18

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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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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