Vitamin A deficiency occurs when the body does not have enough vitamin A to support normal vision, immune function, skin health and other physiological processes. This can happen when dietary intake is too low over time, when the body cannot absorb or store the vitamin properly, or when needs are increased due to certain health conditions or life stages. Recognizing the signs of vitamin A deficiency can help you understand when to seek professional guidance. This page provides a broad overview of the symptoms, causes, diagnosis, treatment and prevention of vitamin A deficiency and serves as a starting point for exploring the topic. More specific questions are addressed in related articles linked throughout the site.
What Is Vitamin A Deficiency?
Vitamin A is a fat-soluble nutrient that exists in several forms, including retinol, retinal, retinoic acid and provitamin A carotenoids such as beta-carotene. It is stored primarily in the liver and plays a role in many bodily functions, including the maintenance of normal vision, the functioning of the immune system, and the health of skin and mucous membranes. A deficiency develops when the body does not have adequate stores or intake to meet its needs.
Vitamin A deficiency is considered a public health concern in some parts of the world, particularly in low-income countries where dietary diversity may be limited. In higher-income countries, overt deficiency is less common, but subclinical deficiency or inadequate intake can still occur, especially in certain groups. These may include people with fat malabsorption disorders, liver disease, cystic fibrosis, or those who have undergone certain types of surgery. Pregnant and breastfeeding women, infants and young children may also be at higher risk if their intake is insufficient.
Signs and Symptoms to Be Aware Of
The signs of vitamin A deficiency can vary depending on the severity and duration of the deficiency. Early symptoms may be subtle and easily attributed to other causes. As the deficiency progresses, more specific symptoms can appear. The following are commonly described signs:
- Night blindness or difficulty seeing in dim light
- Dry, gritty or irritated eyes
- Bitot's spots – foamy, chalky patches on the white of the eye
- Dry, scaly or rough skin
- More frequent infections or a weaker immune response
- Delayed growth or development in children
- Slow wound healing
It is important to note that these symptoms are not exclusive to vitamin A deficiency and can have other causes. If you notice any of these signs, consult a healthcare professional for an accurate evaluation rather than attempting to self-diagnose or self-treat.
Causes and Risk Factors
Vitamin A deficiency can result from several factors, often working together. The most common causes include:
- Inadequate dietary intake of vitamin A-rich foods over time
- Fat malabsorption conditions, such as celiac disease, Crohn's disease, cystic fibrosis or cholestasis, which can impair the absorption of fat-soluble vitamins
- Liver disorders that affect the storage and release of vitamin A
- Certain medical treatments or surgeries that affect the digestive tract
- Increased needs during pregnancy, breastfeeding, infancy and childhood
- Alcohol use disorder, which can affect vitamin A metabolism and storage
In some cases, deficiency may be subclinical, meaning there are no obvious symptoms but the body's stores are low. This is why a professional assessment is important if you have risk factors or concerns.
How Vitamin A Deficiency Is Diagnosed
Diagnosis of vitamin A deficiency typically begins with a medical history and physical examination. A healthcare professional will ask about your symptoms, dietary habits, medical conditions, medications and any history of gastrointestinal surgery or disorders. They may also ask about your vision, skin and frequency of infections.
If a deficiency is suspected, blood tests may be ordered to measure serum retinol levels. However, serum retinol can be within the normal range even when liver stores are low, so results are interpreted alongside clinical signs and other factors. In some cases, other tests such as a complete blood count or liver function tests may be used to rule out other conditions. It is important to remember that only a qualified healthcare provider can accurately diagnose a vitamin A deficiency.
Treatment and Prevention
Treatment for vitamin A deficiency depends on the severity and underlying cause. In cases of mild deficiency, increasing dietary intake of vitamin A-rich foods may be sufficient. In more severe cases or when absorption is impaired, a healthcare professional may recommend vitamin A supplements. Because excessive vitamin A can be toxic, supplementation should only be done under medical supervision and at recommended doses.
Prevention focuses on maintaining a balanced diet that includes sources of vitamin A. Foods rich in preformed vitamin A include liver, fish liver oils, eggs and dairy products. Provitamin A carotenoids are found in orange and yellow vegetables such as carrots, sweet potatoes and pumpkin, as well as in leafy greens like spinach and kale. For those who follow a plant-based diet, ensuring adequate intake of carotenoid-rich foods and considering fortified options may be helpful. If you have a condition that affects fat absorption or liver function, discuss with your healthcare provider how to monitor and maintain your vitamin A status.
When to See a Doctor
If you notice any symptoms that could be related to vitamin A deficiency, such as persistent night blindness, dry eyes, skin changes or frequent infections, it is advisable to seek professional evaluation. Additionally, if you have a known risk factor for deficiency, such as a malabsorption disorder, liver disease or a history of bariatric surgery, regular monitoring may be recommended. Do not attempt to diagnose or treat yourself with high-dose supplements without medical guidance.
Explore Related Topics and Supplements
To learn more about vitamin A and related nutrients, you can explore our vitamin A benefits, sources and safety guide. For general nutritional support, you may also be interested in our multivitamin guide. If you are looking for products, browse our selection of natural supplements.
This information is for educational purposes only and is not a substitute for professional medical advice. Always consult a healthcare provider for personalized guidance.
