Excess Vitamin A




Excess Vitamin A


Carbohydrates, fat and protein

Carbohydrates and sugars

Fats and lipids


Nutritional disorders

Vitamin K deficiency

Vitamin D deficiency

Excess Vitamin A

Excess Vitamin D

Folate (Vitamin B9) deficiency

Niacin (Vitamin B3) deficiency

Vitamin B12 deficiency

Vitamin C deficiency

Wernicke-Korsakoff syndrome


Iodine deficiency

Zinc deficiency



Fat-soluble vitamin deficiency and toxicity: Pathology review

Zinc deficiency and protein-energy malnutrition: Pathology review

Water-soluble vitamin deficiency and toxicity: B1-B7: Pathology review


Excess Vitamin A


0 / 4 complete

USMLE® Step 1 questions

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High Yield Notes

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Excess Vitamin A

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USMLE® Step 1 style questions USMLE

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A 25-year-old woman goes to the clinic for the evaluation of worsening acne. The lesions are painful, and the patient is concerned as the symptoms have worsened. Her acne has been present for the past 2 years. Past medical history is otherwise unremarkable. She is sexually active with a male partner and uses condoms occasionally. The patient currently uses topical erythromycin and topical tretinoin, and she washes her face twice daily with benzoyl peroxide. Vitals are within normal limits. Physical examination shows multiple large  >5 mm cystic nodules scattered over the face and upper trunk. The remainder of the examination is unremarkable. The physician switches the patient to oral isotretinoin and schedules her for the next follow-up. If the patient conceives while on this new medication, which of the following would her fetus be most at risk of developing?  

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Excess vitamin A, also referred to ask hypervitaminosis A, refers to the toxic effects of ingesting too much of preformed vitamin A. Excess vitamin A causes problems such as liver damage, joint pain, headache, dry skin, alopecia, and birth defects which is the reason why it is contraindicated in pregnant women.


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