What are the symptoms of high blood pressure? When we think about symptoms of a disease, our bodies usually warn us when something is wrong, but it's a different story with high blood pressure. While many people won't experience symptoms, once your blood pressure reaches an alarming level, some symptoms to look for would include headaches, shortness of breath, nosebleeds, and dizziness. These symptoms can mean many different things. So once you experience any of these symptoms, make sure to look for immediate medical attention with your doctor.