Version October 2024
| Deficient intake or absorption |
| Dietary |
| Malabsorption |
| Gastric bypass (bariatric surgery, gastrectomy) |
| Small bowel disease |
| Pancreatic insufficiency |
| Decreased skin synthesis |
| Inadequate sunlight exposure |
| Full sunscreen use |
| Darkly pigmented skin |
| Defective 25-hydroxylation |
| Cirrhosis |
| Obesity (possibly) |
| Increased catabolism of vitamin D to inactive metabolites |
| Antiseizure medications |
| Loss of vitamin D binding protein |
| Nephrotic syndrome |
| Defective 1-alpha 25-hydroxylation |
| Hypoparathyroidism |
| Kidney failure |
| 1-alpha hydroxylase deficiency (vitamin D-dependent rickets, type 1) |
| Defective target organ response to calcitriol |
| Hereditary vitamin D-resistant rickets (vitamin D-dependent rickets, type 2) |
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