We all have things that thoroughly tick us off. Sometimes it's a pet peeve. Sometimes it's an injustice. Every time we get angry we are putting ourselves at risk for the problems high blood pressure can cause.
Short Term Risks : According to WebMD , even a short term bout of fury increases the likelihood of a heart attack or a stroke. If you add other things that cause stress (like the reason for anger in the first place) the chances increase. Is letting out your anger by smashing things and yelling at people worth your life?
Long Term Risks : Short bouts of anger can be defused fairly easily if they are rare. Once the situation has calmed down the person does and so does blood pressure.
On the other hand, if you are angry all of the time your blood pressure is going to be high all of the time. There are a lot of valid things out there that cause cause rage but they can not be fixed if those who feel it the strongest are dead.
Fixing the Problem : I mean this in two ways. The first is to proactively work to fix the problem. If you are angry about kill Shelters then volunteer your time for rescue, TNR or no kill Shelters. If your city has many homeless and their condition others you, start or work with organizations that reach out to that population. You may be surprised at how many opportunities you have to turn your anger into something useful and beautiful.
The other part is fixing your internal issues. Nonmedical intervention may include meditation and deep breathing techniques. You may need medical help, especially if your blood pressure is really high. Explain the problem … all of it … to your doctor. A combination of therapies could reduce your numbers and help you turn what you feel into something meaningful.