Beriberi occurs due to the deficiency of:
Vitamin B1
Beriberi is a nutritional disorder caused by a deficiency of thiamin (vitamin B1) and characterized by impairment of the nerves and heart. The deficiencies of Vitamin A leads to night blindness, Vitamin B2 results in ariboflavinosis (retarded growth and mental health) and Vitamin B12 deficiency leads to pernicious anaemia.