Well, that’s because the heart is close to the left arm. However, when you smoke, drink alcohol, in cold temperatures, or are stressed, the doctor recommends taking blood pressure in both arms. Doing so enables them to get an accurate measurement. There you have it! Now, you already know what to do the next time you’re taking your or someone else’s BP. However, if you are not sure about the results in any special condition, look for professional help. Only a certified professional can help you understand the unique case and make the right medical decisions in time.