Low blood pressure, or hypotension, is not normally a cause for concern, unless the individual has other symptoms. Hypotension is classified as any blood pressure rating lower than 90/60.
WebMD states that low pressure should always be checked out by a doctor when occurring in elderly patients, due to the possibility of underlying problems that can damage the heart, brain and other organs. Sudden drops in blood pressure leading to dizziness can also be serious in patients of any age, and should always be checked out by a doctor. If the blood pressure drops after taking certain medications, such as medication for erectile dysfunction, a physician should immediately be seen by the sufferer.