What is a common symptom of vitamin A deficiency?

Vitamin A plays a crucial role in maintaining healthy vision, particularly in low light conditions. A deficiency in vitamin A can lead to a condition known as night blindness, which is characterized by difficulty seeing in dim light or darkness. This occurs because vitamin A is essential for the synthesis of rhodopsin, a protein in the eyes that allows for the perception of light and dark. When there is inadequate vitamin A, the regeneration of rhodopsin is impaired, which directly results in poor night vision.

Although skin rashes, fatigue, and joint pain can stem from various nutritional deficiencies or health issues, they are not specifically linked to vitamin A. Skin rashes may be associated with other vitamin deficiencies such as B vitamins or vitamin E. Similarly, fatigue might be related to iron or vitamin D deficiencies, while joint pain could arise from conditions such as arthritis or other factors unrelated to vitamin A.