Both vitamin B1 and vitamin B2 belong to the B vitamins, which are water-soluble vitamins. The differences between vitamin B1 and vitamin B2 are as follows: First, the structures are different. Second, the roles are different. Vitamin B1, also known as thiamine or anti-nerve factor, can promote the development of the nervous system and brain development, and can be used in the treatment of neuritis. Vitamin B2 mainly promotes the development of hair, skin, nails, etc., and participates in the oxidation of substances and energy metabolism in the body, etc. Third, the symptoms when deficient are different, vitamin B1 deficiency is mainly prone to foot disease, but not fungal infection of foot disease, can also be accompanied by fatigue and weakness, poor appetite and other symptoms, vitamin B2 deficiency is mainly manifested as stomatitis, tongue inflammation, lip inflammation, etc.