Collocations for deficiency - noun

major, serious, severe | slight, small | dietary, nutritional | enzyme, hormone, mineral, nutrient, vitamin | calcium, iron, etc.

have, suffer from
suffering from a severe vitamin deficiency

correct, make good, make up, overcome, remedy
I''ve been prescribed iron tablets to make up the deficiency. | An engineer could remedy the deficiencies in the design.

~ in
serious deficiencies in the health service