Vitamins are indispensable elements in the human body, and there are many types of vitamins, commonly including vitamin A, vitamin C and vitamin D. Deficiency of different kinds of different symptoms, such as lack of vitamin A can lead to eye discomfort, lack of vitamin C can lead to subcutaneous hemorrhage and so on. 1. Vitamin A deficiency:Dry eyes, loss of vision and dry skin will occur. 2. Vitamin C deficiency:Skin dullness and lack of luster, there will be subcutaneous bleeding, bleeding gums and so on. 3. Vitamin D deficiency:There will be calcium absorption disorders, which will be manifested as rickets etc. in children and osteoporosis etc. in adults. Every vitamin in the body plays an important role in maintaining human health. Normally, we should pay attention to a balanced diet, moderate intake of food with high vitamin content, such as fresh vegetables and fruits.