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Donna Hill Howes, RN, Family Medicine, answeredVitamin deficiencies can cause a number of symptoms that are similar to those observed in people with schizophrenia. When people neglect to eat a balanced diet, vitamin deficiencies can result, sometimes causing serious symptoms. Common vitamin deficiencies include folate deficiency anemia, vitamin B-12 deficiency anemia, vitamin D deficiency, and vitamin C deficiency anemia. A shortage of vitamin D can lead to thyroid problems, sometimes causing symptoms that mimic schizophrenia. Lack of B-12 can cause problems including confusion, forgetfulness, and other symptoms. To rule out a vitamin deficiency, a doctor will run a blood test and other laboratory tests when treating a person with these symptoms.Helpful? 1 person found this helpful.