If a patient’s systolic blood pressure, also known as high pressure, is 90 mmHg and diastolic blood pressure, also known as low pressure, is 70 mmHg, this level of blood pressure is abnormal and is considered low blood pressure. Some patients are born with low blood pressure due to family hereditary reasons, and these patients often do not have any uncomfortable symptoms and do not need special treatment. If a patient has recently experienced a drop in blood pressure, it is important to find out the cause of the drop, such as whether it is caused by frequent nausea, vomiting, gastrointestinal flu, or the cachectic state of patients with tumors or malnutrition may also trigger a drop in blood pressure. Some patients may suffer from excessive bleeding and blood loss, which can also trigger a drop in blood pressure. Some patients may overdose on drugs that lower blood pressure, which can also cause blood pressure to fall below the normal range.