Dizziness, fainting, blurred vision, nausea and fatigue are some of the symptoms of low blood pressure, or hypotension, according to Mayo Clinic. Lack of concentration, depression, thirst, shallow breathing and cold, clammy skin are also symptoms of the disorder.
Hypotension occurs when either systolic or diastolic blood pressure readings fall below normal ranges, notes Mayo Clinic. Doctors categorize the condition as orthostatic or postural hypotension when it occurs while standing up, and postprandial hypotension when it occurs after eating. Neurally mediated hypotension is a disorder that occurs when there is a miscommunication between the heart and the brain that leads the brain to improperly lower the heart rate. Athletes, people who exercise regularly, and nonsmokers tend to have lower blood pressure, as do people who maintain normal weights.
Pregnancy, heart problems, and dehydration can cause hypotension, as can certain medications such as diuretics, beta and alpha blockers, and some antidepressants, notes Mayo Clinic. Lack of nutrients in people's diets can also cause hypotension, because the body does not produce enough red blood cells without the presence of vitamin B-12 and folate. A sudden drop in blood pressure can be life-threatening, especially if the drop is associated with uncontrolled bleeding, severe infections or severe allergic reactions. People displaying the symptoms of hypotension should see their doctors for treatment and to rule out more serious medical problems.