In recent years, the 93-year-old Bush has been in and out of the hospital for various ailments.
Bush was diagnosed with a form of Parkinson's disease that has forced him to use a motorized scooter or a wheelchair for mobility.
Over Christmas in 2012, he was admitted into a Houston intensive care for a bronchitis-related cough and other issues.
For about a week in December 2014, he spent time in the hospital for shortness of breath.
While in Maine in 2015, Bush had to have surgery after breaking a bone in his neck from a fall. A doctor estimated a three-to-four-month recovery time for the injury.
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In January 2017, Bush was admitted to the hospital for pneumonia. Over the 16-day stay, the president spent some time in intensive care and had a breathing tube connected to a ventilator inserted into his airway. This time in the hospital was noted for his wife Barbara Bush also being treated for fatigue and a cough.
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It wasn't too long after that that Bush would head back to the hospital in April 2017, spending two weeks in the hospital for another bout with pneumonia and chronic bronchitis. Bush's doctors said chronic bronchitis is a condition more prevalent with age and can aggravate the symptoms of pneumonia.
RELATED: President George H.W. Bush hospitalized after mild case of pneumonia
A week after arriving in Kennebunkport, Maine, where he spends the summer, the former president was admitted to the hospital.
Spokesperson Jim McGrath said in a statement released on May 27 that Bush was admitted to Southern Maine Health Care after experiencing low blood pressure and fatigue.
He will likely stay there for the next few days. According to the statement, the president was awake, alert and not in any pain.
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The Associated Press contributed to this report.