What is high blood pressure?
Blood pressure is a measure of how hard the blood pushes against the walls of the arteries as it moves through the body. High blood pressure happens when the blood is pushing too hard. Another name for high blood pressure is hypertension.
Blood pressure readings include two numbers. For example, a child's reading might be 96/57 or "96 over 57."
- The first number is the systolic pressure. This shows how hard the blood pushes when the heart is pumping.
- The second number is the diastolic pressure. This shows how hard the blood pushes between heartbeats, when the heart is relaxed and filling with blood.
What is normal for children?
What is normal and what is high blood pressure depends on your child's age, sex, and height. The numbers will change as your child gets older and grows.
High blood pressure does not have symptoms, but it needs to be treated.
If blood pressure is very high, it can cause serious damage to a child's body, especially the heart and brain. But these serious problems can be prevented by lowering the high blood pressure.
What causes high blood pressure in children?
In some cases, doctors can't say exactly what causes high blood pressure. But several things make a child more likely to develop high blood pressure. These include having a family history of high blood pressure and being overweight.
High blood pressure also can be caused by other health problems, such as sleep apnea or heart or kidney problems. Or it can be caused by medicine the child is taking.
How is high blood pressure in children diagnosed?
Children ages 3 and over often have their blood pressure checked during routine checkups. If your child has a reading of high blood pressure, you may be asked to bring in your child again for another blood pressure check.
Your child's doctor might also have your child wear a portable device to measure blood pressure over 24 hours. This is called ambulatory blood pressure monitoring.
Having high blood pressure can make heart disease more likely. Your doctor may check your child for risk factors for heart disease, such as high cholesterol or diabetes. A risk factor is something that makes a disease more likely.
How is it treated?
High blood pressure can be treated with lifestyle changes and medicine. If another health problem is causing the high blood pressure, treating the problem usually lowers the blood pressure.
Your child's doctor will likely want you to try lifestyle changes first. Help your child lose weight, if your child is overweight. Eating healthy foods and being physically active are the best ways to do this. Avoid putting your child on a weight-loss diet.
- Help your child be more active. Children need at least 1 hour of physical activity every day.
- Set limits on your child's daily television and recreational screen time. Sit down with your child and plan out how he or she will use this time allowance. The Canadian Society for Exercise Physiology (CSEP) recommends limiting TV and recreational screen time to less than 1 hour a day for children 2 to 4 years old.footnote 1 Aim for 2 hours or less a day for children 5 years and older.footnote 2 And it's best for children younger than 2 to not watch TV, watch movies, or play games on a screen.
- Encourage your child to eat more fresh fruit and vegetables, fibre, and non-fat dairy products. Help your child eat fewer high-sugar and high-sodium foods and drinks.
- Work on lifestyle changes together as a family. For example, try to eat as a family at regular times, and find an activity you all can do.
These healthy habits are also the key to preventing high blood pressure.
Medicines are used to treat high blood pressure when lifestyle changes do not work or if blood pressure is very high. Some children may be able to stop taking the medicine after their blood pressure comes down, especially if they are overweight and lose weight. Your doctor can tell you how long your child may need medicine.
It can be hard to remember to help your child take pills when he or she has no symptoms. But blood pressure will go back up if your child does not take the medicine. Make your child's pill schedule as simple as you can. Try to plan a time for your child to take medicine along with something else that happens at that same time every day. This can be something like eating a meal or getting ready for bed. If that is hard to do, you or your child can set a daily alarm as a reminder.
Medicines for high blood pressure can have side effects. Ask your doctor what side effects to look for and what to do if you see them.
Do you have any questions or concerns after reading this information? It's a good idea to write them down and take them to your next doctor visit.
- Canadian Society for Exercise Physiology (2016). Canadian 24-Hour Movement Guidelines for the Early Years (0-4 years): An Integration of Physical Activity, Sedentary Behaviour and Sleep. Available online: https://csepguidelines.ca/early-years-0-4.
- Canadian Society for Exercise Physiology (2016). Canadian 24-Hour Movement Guidelines for Children and Youth (ages 5-17 years): An Integration of Physical Activity, Sedentary Behaviour and Sleep. Available online:https://csepguidelines.ca/children-and-youth-5-17.
Other Works Consulted
- Expert Panel on Integrated Guidelines for Cardiovascular Health and Risk Reduction in Children and Adolescents (2011). Expert panel on integrated guidelines for cardiovascular health and risk reduction in children and adolescents: Summary report. Pediatrics, 128(Suppl 5): S213–S256.
- U.S. Preventive Services Task Force (2013). Screening for primary hypertension in children and adolescents. http://www.uspreventiveservicestaskforce.org/uspstf/uspshypechld.htm. Accessed January 11, 2014.
Current as of: December 16, 2019
Author: Healthwise Staff
Kathleen Romito MD - Family Medicine
Thomas Emmett Francoeur MD MDCM, CSPQ, FRCPC - Pediatrics
Martin J. Gabica MD - Family Medicine
Adam Husney MD - Family Medicine
John Pope MD - Pediatrics
Current as of: December 16, 2019