The CDC says nearly half of Americans have high blood pressure, but a recent survey found many don't know they have it. NBC News medical reporter Dr. Akshay Syal joins TODAY to share the dangers of the condition, its causes, how to check it at home and how to control it, including exercise and avoiding processed food. » Subscribe to TODAY: youtube.com/@TODAY TODAY brings you the latest headlines and expert tips on money, health and parenting. We wake up every morning to give you and your family all you need to start your day. If it matters to you, it matters to us. We are in the people business. Subscribe to our channel for exclusive TODAY archival footage & our original web series. Connect with TODAY Online! Visit TODAY's Website: today.com Find TODAY on Facebook: facebook.com/today Follow TODAY on Twitter: twitter.com/TODAYshow Follow TODAY on Instagram: instagram.com/todayshow » Stream TODAY All Day: today.com...