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Clinical symptoms in patients with vitamin B12 deficiency according to vitamin B12 levels
| Vitamin B12 deficiency | Absolute vitamin B12 deficiency (<200 pg/mL) | Borderline vitamin B12 deficiency (200–300 pg/mL) |
|---|---|---|
| Clinical symptoms, n (%) | ||
| Headache | 79 (35) | 148 (65) |
| Seizure | 19 (46) | 22 (54) |
| Dizziness | 8 (26) | 23 (74) |
| Syncope | 9 (69) | 4 (31) |
| Paresthesia | 4 (36) | 7 (64) |
| Developmental delay | 5 (55) | 4 (45) |
| Fatigue | 5 (50) | 5 (50) |
| Tremor | 2 (67) | 1 (33) |
| Forgetfulness | 0 | 1 (100) |
| Myoclonus | 3 (60) | 2 (40) |
