| Diabetes (588) | |
| Dwarfism (8) | |
| Goiter (1) | |
| Hyperthyroidism (1) | |
| Hypothyroidism (3) | |
| Mastitis (6) | |
| Mucopolysaccharidosis (2) |
Pregnancy can also lower Vitamin b12 levels as can hyperthyroidism (overactive thyroid) if it causes the person to produce too much body heat according to the NIH.
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