1 / 5Acne and dryness in the skin can be a result of various hormonal changes. These changes in your skin may be a sign of deficiency in certain vitamins. The deficiency of vitamins A and E can cause acne on the face, while deficiency of vitamin B12 can lead to low levels of acne.2 / 5Allergies can cause your eyes to swell. But if it happens more often or happens every morning on waking up, it could be a sign of low iodine levels in the body. Studies have linked iodine deficiency to thyroid diseases, which often cause fatigue.3 / 5Vitamin C deficiency can cause serious harm to the body. One of the warning signs is bleeding gums, also known as 'scurvy'. Other symptoms may include easy bruising, bleeding, joint and muscle pain.4 / 5Paleness and discoloration of the lips can be a sign of some underlying disease. However, it is often one of the most common symptoms of anemia, a condition characterized by low levels of red blood cells in the body.5 / 5If your hair is dry and damaged, your body may be deficient in biotin, also known as vitamin B7. Biotin is a nutrient that helps keep your hair nourished. Therefore low levels of biotin lead to, dry hair and dandruff.