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Pupil dilation

Pupil dilation: Introduction

Pupil dilation: Pupils appearing larger than normal. See detailed information below for a list of 24 causes of Pupil dilation, Symptom Checker, Assessment Questionnaire, including diseases and drug side effect causes.

» Review Causes of Pupil dilation: Causes | Symptom Checker » | Assessment Questionnaire »

Causes of Pupil dilation:

The following medical conditions are some of the possible causes of Pupil dilation. There are likely to be other possible causes, so ask your doctor about your symptoms.

» Review Causes of Pupil dilation: Causes | Symptom Checker » | Assessment Questionnaire »

Home Diagnostic Testing and Pupil dilation

Home medical tests possibly related to Pupil dilation:

Causes of Types of Pupil dilation:

Review the causes of these more specific types of Pupil dilation:

Review causes of more specific types of Pupil dilation:

Pupil dilation: Symptom Checker

Listed below are some combinations of symptoms associated with Pupil dilation, as listed in our database. Visit the Symptom Checker, to add and remove symptoms and research your condition.

Symptom Checker

Symptom Checker

Pupil dilation Treatments

Review further information on Pupil dilation Treatments.

Stories from Users for Pupil dilation

Real-life user stories relating to Pupil dilation:

Message Boards for Pupil dilation

Symptom specific forums: The following patient stories in our interactive forums and message boards relate to Pupil dilation or relevant symptoms:

Diagnostic tests for Pupil dilation:

Various tests are used in the diagnosis of Pupil dilation. Some of these are listed below :

  • Eye examination
    • Inspect the eye noting the nature of redness, if present. This will help delineate iritis and glaucoma
    • Examine the pupils for size, shape, equality and regularity
    • Test the light and accommodation reflexes of the pupils. Usually a light shone into the pupils will cause the pupil to constrict. Usually focusing from a far object to a near object will cause the pupil to constrict
    • Unilateral pupil dilation which is not reactive to light or accommodation (focusing on near object) should suggest oculomotor nerve (third cranial nerve) palsy due to a ruptured brain aneurysm or intracranial haematoma (brain blood clot). If a unilateral dilated pupil does react to light or accommodation, must consider a local eye condition such as iritis, glaucoma, anisocoria (a condition in which the two pupils are not of equal size) or irritation of the cervical sympathetic nerves. If a unilateral dilated pupil reacts to accommodation but not to light, must consider neurosyphilis. If a unilateral dilated pupil does not react to light or accommodation, must consider blindness due to optic nerve (second cranial nerve) lesions
    • Visual acuity (sight test). The presence of blindness with a dilated pupil would suggest an optic nerve lesion (second cranial nerve)
  • more tests...»

Pupil dilation: Animations

Drug interactions causing Pupil dilation:

When combined, certain drugs, medications, substances or toxins may react causing Pupil dilation as a symptom. Always advise your doctor of any medications or treatments you are using, including prescription, over-the-counter, supplements, herbal or alternative treatments.

Pupil dilation: Comorbid Symptoms

Some of the comorbid or associated medical symptoms for Pupil dilation may include these symptoms:

Causes of General Symptom Types

Research the causes of these more general types of symptom:

Research the causes of related medical symptoms such as:

Causes of Similar Symptoms to Pupil dilation

Research the causes of these symptoms that are similar to, or related to, the symptom Pupil dilation:

Assessment Questionnaire: Questions your doctor may ask (and why!)

During a consultation, your doctor will use various techniques to assess the symptom: Pupil dilation. These will include a physical examination and possibly diagnostic tests. (Note: A physical exam is always done, diagnostic tests may or may not be performed depending on the suspected condition) Your doctor will ask several questions when assessing your condition. It is important to openly share any pertinent information to help your doctor make an accurate diagnosis.

It is also very important to bring an up-to-date list of all of your all medical conditions, medications including dosages, and names of numbers of any specialist you see.

Create your printable checklist here.

See Pupil dilation Assessment Questionnaire (11 listings)

Pupil dilation: Deaths

Read more about causes and Pupil dilation deaths.

Pupil dilation: Research Related Doctors & Specialists

Other ways to find a doctor, or use doctor, physician and specialist online research services:

Pupil dilation: Undiagnosed Conditions

Conditions that are commonly undiagnosed in related areas may include:

Organs affected by Pupil dilation:

The list of organs typically affected by Pupil dilation may include, but is not limited to:

Detailed list of causes of Pupil dilation

The list below shows some of the causes of Pupil dilation mentioned in various sources:

How Common are these Causes of Pupil dilation?

This information refers to the general prevalence and incidence of these diseases, not to how likely they are to be the actual cause of Pupil dilation. Of the 24 causes of Pupil dilation that we have listed, we have the following prevalence/incidence information:

  • 0 causes are "very common" diseases
  • 1 causes are "common" diseases
  • 1 causes are "uncommon" diseases
  • 1 causes are "rare" diseases
  • 2 causes are "very rare" diseases
  • 21 causes have no prevalence information.

Conditions listing medical symptoms: Pupil dilation:

The following list of conditions have 'Pupil dilation' or similar listed as a symptom in our database. This computer-generated list may be inaccurate or incomplete. Always seek prompt professional medical advice about the cause of any symptom.

Select from the following alphabetical view of conditions which include a symptom of Pupil dilation or choose View All.

View All A B C D E I M O P R S





  • Eye neuropathy ... reduced pupil constrictions, reduced pupil dilation, reduced pupil response






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Causes of Pupil dilation Based on Risk Factors

This information shows analysis of the list of causes of Pupil dilation based on whether certain risk factors apply to the patient:

  • Travel - has the patient travelled recently?
  • Diabetes - history of diabetes or family history of diabetes?

    Doctors and specialists: Who should I consult about Pupil dilation?

    Depending on the seriousness of the onset of Pupil dilation, you may want to consult one of the following medical professionals.

    Important:In extreme cases, always seek advice from emergency services :

    Classifications of Pupil dilation:

    Subtypes of Pupil dilation:

    Mydriasis (45 causes)

    Medical Conditions associated with Pupil dilation:

    Pupil symptoms (182 causes), Eye symptoms (5412 causes), Face symptoms (8109 causes), Head symptoms (10192 causes)

    Symptoms related to Pupil dilation:

    Pupil contraction, Pupil symptoms (182 causes), Eye symptoms (5412 causes), Illicit drugs, Amphetamine intoxication, Drug overdose, Medication overdose, Certain medications, Certain eyedrop medications, Brain injury, Stroke (192 causes), Brain tumor (27 causes), Adie's syndrome

    Medical articles on signs and symptoms:

    Doctor-patient articles related to symptoms and diagnosis:

    These general medical articles may be of interest:

    Evidence Based Medicine Research for Pupil dilation

    Medical research papers related to Pupil dilation include:

    Research More Evidence-Based Medicine at

    More Ways To Research Medical Signs and Symptoms:


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