Ralph Klein is in a Calgary hospital being treated for lung disease, officials said in a news release Friday.

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Former Alberta Premier Ralph Klein is in a Calgary hospital, officials said Friday. (CBC)

The long-time premier of Alberta has been hospitalized twice in recent weeks because of issues related to chronic obstructive pulmonary disorder and aphasia,  according to Alberta Health Services.

Klein is resting comfortably and is expected to be discharged within the week, the release said.

His family is asking for privacy while they deal with his health issues.

Premier Ed Stelmach tweeted a message on Friday, saying he and his wife Marie "send our love and prayers to our dear friends Ralph and Colleen Klein."

Earlier this year it was revealed that Klein had also been diagnosed with fronto-temporal dementia, which can interfere with the ability to sustain a thought, maintain a conversation, read or write.

The former premier was diagnosed with lung disease in 2009.

Klein led the Progressive Conservative Party to four consecutive majorities beginning in 1993. He resigned as premier in 2006. He was mayor of Calgary from 1980 to 1989.