Police are appealing for information about a missing Christchurch woman.

Andrea Ming, 51, went missing about 1.10pm today.

She was wearing a bright red floral dress and has recently shaved her head. She is diabetic and is due for her medication.

She is described as sociable, but police said she is vulnerable due to a brain injury.

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Police are asking anyone with information on her whereabouts to call Christchurch police on 03 363 7400.