(HealthDay News) -- Aspirin therapy may help reduce the risk of heart attack by thinning the blood and preventing clots. But it's not safe for everyone.

The University of California - Davis Health System says you should be wary of aspirin therapy if you:

  • Have kidney or liver disease.
  • Drink three or more alcoholic beverages daily.
  • Have uncontrolled high blood pressure.
  • Take a blood-thinning medication.
  • Have any possible symptoms of stroke.