She had a history of heart problems for five years before her death.

He had been free of known heart problems since then.

Her son said she did not have a history of heart problems.

He died two years ago of heart problems at age 61.

A level above 150 may increase your risk for heart problems.

All three were known to have had a heart problem.

At the time this was thought to be because of a heart problem.

He'd been in and out of the hospital for heart problems during the last two years.

Within the year, at age 62, he was dead of heart problems.

Since then, he has developed a history of heart problems.