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 thiamine deficiency can be addressed by increasing thiamine intake.