*Vitamins and Their Deficiency Diseases* 1. *Vitamin A*: Night Blindness 2. *Vitamin B1 (Thiamine)*: Beriberi 3. *Vitamin B2 (Riboflavin)*: Ariboflavinosis 4. *Vitamin B3 (Niacin)*: Pellagra 5. *Vitamin B5 (Pantothenic acid)*: Paresthesia 6. *Vitamin B6*: Anemia 7. *Vitamin B7 (Biotin)*: Dermatitis and Enteritis 8. *Vitamin B9 (Folic acid) and B12*: Megaloblastic Anemia 9. *Vitamin B17 (Amygdalin)*: Cancer (Note: The effectiveness of Vitamin B17 in treating cancer is disputed and not widely accepted by the medical community) 10. *Vitamin C*: Scurvy and Swelling of Gums 11. *Vitamin D*: Rickets and Osteomalacia 12. *Vitamin E*: Low Fertility 13. *Vitamin K*: Bleeding Disorders (Non-Clotting of Blood) Please note that while vitamins are essential nutrients, it's important to consult a healthcare professional for accurate information and treatment of deficiency diseases.