All gradual: The symptoms tend to be gradual as in the case of osteoporosis. In my experience, some patients may develop an itchy skin rash from vitamin d deficiency (no published report ) as vit d3 is considered an immune regulator, some have considered its deficiency to play a role in multiple sclerosis. Another reported noted reduced response to inhaled steroid in children with asthma when vit d3 is low.
Answered 12/6/2019
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Consider GI absorpti: If the GI tract is dysfunctional (e.g., celiac disease) or short (e.g., various bypass surgeries for obesity), absorption of vit. D and iron can both be affected.
Answered 6/10/2014
4.5k views
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