Rickets, scurvy and beriberi occur due to deficiency of
Vitamins
Rickets - This condition is brought on by a lack of vitamin D, which causes the body to be unable to absorb or deposit calcium. Less commonly, it can also be caused by a lack of calcium or phosphorus.
Scurvy is caused by a lack of vitamin C.
Beriberi is a disease caused by a vitamin B-1 deficiency, also known as thiamine deficiency.