High blood pressure often presents few or no symptoms, reports the American Heart Association. When symptoms present themselves, it is during hypertensive crisis, which can cause severe headaches, anxiety, shortness of breath and nosebleeds.
Although high blood pressure does not often cause symptoms, there are certain symptoms that may be indirectly related to high blood pressure, states the American Heart Association. These symptoms include blood spots in the eyes, facial flushing and dizziness. For example, high blood pressure does not cause blood spots in the eyes; however, they are more common in those who already have high blood pressure.
About one in three Americans have high blood pressure, according to the National Heart, Lung, and Blood Institute. Because the disease is relatively asymptomatic, high blood pressure can often go untreated for years and subsequently damage vitals organs, such as the heart, blood vessels and kidneys.
High blood pressure levels are marked by a systolic reading of 140 or higher or a diastolic reading of 90 or higher, according to the National Heart, Lung, and Blood Institute. Normal blood pressure consists of a systolic reading of 120 or lower, and a diastolic reading of 80 or lower.
Blood pressure can quickly change depending on mood and activity, claims the National Heart, Lung, and Blood Institute. Blood pressure increases with physical activity and mental excitement. It also lowers during sleep. For this reason, the institute stresses regular blood pressure readings to monitor levels.