If both high and low pressure are low, i.e. both systolic and diastolic pressure are low, first rule out whether it is caused by an overdose of antihypertensive medication or by an unreasonable choice of current antihypertensive medication regimen. If it is caused by oral antihypertensive drugs, reduce or stop taking antihypertensive drugs. In addition, patients may also experience a drop in blood pressure in critical states, such as those with advanced heart failure. Patients with acute myocardial infarction may also experience a drop in blood pressure, especially those with right ventricular or inferior wall myocardial infarction who are relatively prone to a drop in blood pressure. It is also possible that a recent lack of food, a cachectic state, or frequent nausea or vomiting may indirectly cause a drop in blood pressure. Some people may also have severe infections and a severe decrease in resistance, which may also cause a drop in blood pressure.