(HealthDay News) -- Blood-thinning medications are typically prescribed after a heart attack or stroke to prevent a recurrence.

But the American Heart Association cautions that these drugs may have significant side effects:

• Bruising easily.
• Nosebleeds.
• Bleeding gums.
• Excessive bleeding caused by shaving cuts.

If you have any of these symptoms after starting blood-thinning therapy, tell your doctor.