(HealthDayNews) -- If you see stars after bumping your head, get immediate medical help because you could have a serious injury, according to St. John Ambulance, the emergency medical response organization for Halton Hills, Ontario, Canada.

Other signs a blow to the head needs medical attention include:

• A headache that doesn't ease up.
• Nausea and vomiting.
• Blurred vision.
• Memory loss.
Change in breathing, pulse and body temperature.