Both numbers are important. This is why doctors treat blood pressure if either are high.

For example:

• Your risk of heart problems or stroke doubles if
  Top number increases by 20 (e.g. goes from 120 -> 140)
• Or the bottom number increases by 10 (e.g. goes from 90 -> 100)

Both numbers are important. This is why doctors treat blood pressure if either are high. But in most people the top number is high. And the bottom number is usually not high on its own. So that’s why doctors often talk about the top number (called systolic)

For example:

• Your risk of heart problems or stroke doubles if Top number increases by 20 (e.g. goes from 120 -> 140)
• Or the bottom number increases by 10 (e.g. goes from 90 -> 100)

Your blood pressure changes to make sure your brain, heart, and muscles have the blood they need.

Your blood pressure goes up when:

• You wake up in the morning
• You exercise
• You get excited
• You feel stressed (for some people this is why their blood pressure is higher at the doctor’s office)

Your blood pressure goes down when:

• You’re relaxing
• You’re sleeping
• You’re feeling calm

These changes are normal and happen to everyone. This is why it’s important to take blood pressure 1-2 times a day. 

Go to the emergency room if:

• You have symptoms like chest or back pain, severe headache, trouble moving or talking, or difficulty breathing

Call your doctor right away if:

• Your blood pressure is 180/110 or higher
• You’re pregnant and your blood pressure is 140/90 or higher

Schedule an appointment if:

• Your blood pressure is 120/80 or higher on multiple readings taken on different days

→ Learn more about when blood pressure is an emergency