The information commissioner will ask the Lancashire force why it disclosed personal information.
Police will be asked about Nicola Bulley health disclosures to ensure they were necessary, information commissioner says.
John Edwards said data protection laws exist “to ensure personal information is used properly and fairly”.
The 45-year-old disappeared three weeks ago during a riverside dog walk in St Michael’s on Wyre in Lancashire.
Lancashire Police were criticised for making her struggles with alcohol and the menopause public.
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