The phrase "deficiency problems" refers to issues or difficulties that arise from a lack or shortage of something needed. It means that there is not enough of something, and it causes problems or challenges. Full definition
For this significant chunk of individuals, eating plants with beta carotene (or taking beta carotene supplements) does not solve their Vitamin A deficiency problems. (philmaffetone.com)
You can not fix that person with anything in your office until they realize that they are suffering from a light deficiency problem. (justinhealth.com)
I have a zinc deficiency problem and I know in the near future I can defeat this one. (perfecthealthdiet.com)