Most headaches are minor, and you can treat them with a pain reliever. Some headaches, however, signal a dangerous or serious medical problem. Don't ignore headaches that aren't explained or headaches that steadily worsen.

Get immediate medical attention if your headache:

• Develops suddenly and severely.
• Persists for several days.
• Causes mental confusion or loss of consciousness.
• Happens with seizures.

Immediate medical attention also is needed if your headache occurs with new:

• Dizziness or loss of balance.
• Weakness or paralysis, such as in the arms or legs.
• Numbness.
• Difficulty speaking or understanding speech.
• Reddened eye.

Also seek medical attention if your headache:

• Occurs with a fever, stiff neck or rash.
• Is accompanied by changes in vision, such as blurring or seeing halos around lights.
• Is serious and follows a recent sore throat or respiratory infection.
• Begins or worsens after a head injury, fall or bump.
• Is triggered by changing the position of your head, coughing, sneezing, bending or physical activity.
• Is a different type of headache from your usual type and you're older than 50.