beri beri is caused by lack of vitamin
Thiamine deficiency, also known as beriberi, is a condition that occurs due to not enough thiamine (vitamin B1). There are two main types: wet beriberi, and dry beriberi. Wet beriberi results in a fast heart rate, shortness of breath, and leg swelling. Dry beriberi results in numbness of the hands and feet, confusion, trouble moving the legs, and pain. A form with loss of appetite and constipation may also occur.
Thiamine deficiency