The document discusses various types of beriberi, a disease caused by thiamine (vitamin B1) deficiency. It identifies four main types of beriberi: dry beriberi which affects nerves in the legs, arms, and torso; wet beriberi which affects the cardiovascular system; Wernicke's encephalopathy which affects brain function; and Korsakoff's syndrome which can develop as a complication of Wernicke's encephalopathy and causes memory loss. It also lists some symptoms of beriberi and notes that consuming foods containing thiamine can help treat and prevent different forms of the disease.