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Causes of Orthostatic Hypotension: From Dehydration and Medication to the Autonomic Nervous System
Orthostatic hypotension does not occur simply because one has a 'low blood pressure constitution.' It happens when the heart and blood vessels fail to compensate in time for the blood that pools in the legs upon standing. It may be due to a lack of fluids or the influence of medication, or it could be a heart or autonomic nervous system issue; therefore, we check your recent physical condition and medications first.
Orthostatic Hypotension Cause Guide
Key points
1First, check for recent diarrhea, vomiting, bleeding, and lack of hydration.
2Do not arbitrarily stop taking blood pressure medications or diuretics; review them with your prescribing healthcare provider.
3Examine concurrent conditions that affect the autonomic nervous system, such as diabetes or Parkinson's disease.
Order of identifying causes starting from recent changes
Gather clues in the order of Dehydration → Medication → Heart/Autonomic System
Confirm the cause and safety before unconditionally increasing water intake or discontinuing medication.
Clues
Possible Causes
Information to Provide
Precautions
After diarrhea, vomiting, or heat exposure
Fluid loss
Intake, urination, and weight
Check for conditions requiring fluid restriction
After medication change
Drug effects
Complete medication list
Do not discontinue medication arbitrarily
Bleeding or black stools
Decrease in blood volume
Time of onset
Prompt medical evaluation
Progressing with diabetes or neurological disease
Autonomic dysfunction
Sweating, digestion, and urination
Systemic evaluation
What the clinic checks first
Will eating more salt resolve the cause?
While regulating salt and fluid intake may help some individuals, it can be harmful for those with hypertension, heart disease, or kidney disease. Do not arbitrarily increase intake without confirming the cause.
More detail
Starting with Common and Reversible Causes
If symptoms started suddenly, your physical condition and changes in medication over the last few days are important clues.
Dehydration and Fluid Loss
Heat, sweating, diarrhea, vomiting, and inadequate food intake can reduce circulating blood volume, making you vulnerable to changes in posture.
Bleeding and Anemia
Conditions such as menorrhagia (heavy menstrual bleeding) or gastrointestinal bleeding can place a burden on blood pressure maintenance and oxygen supply, requiring an investigation into the cause.
After Prolonged Bed Rest
Remaining bedridden for a long period following an illness or surgery can decrease the body's ability to adapt to a standing posture.
Review Your Medications
This does not mean we are blaming the medication or suggesting you stop taking it. It is a process to see if the onset or dosage increase of a drug coincides with the dizziness.
Blood Pressure Medications & Diuretics
Medications that lower blood pressure or reduce body fluids can exacerbate orthostatic symptoms in some individuals.
Neurological & Psychiatric Medications
Certain antidepressants, medications for Parkinson's disease, and sedatives can also affect blood pressure regulation.
Adjust Medications with Healthcare Providers
Since sudden discontinuation can be more dangerous, discuss the possibility of adjusting the administration time and dosage with your prescribing healthcare provider.
Heart and Autonomic Nervous System Causes
If symptoms recur or worsen, the pathways the body uses to compensate for blood pressure must be examined more closely.
Heart Issues
Slow heart rate, arrhythmia, valve issues, and heart failure can limit the increase in blood flow required when standing up.
Autonomic Dysfunction
Diabetic neuropathy, Parkinson's disease, and other neurological disorders can interfere with blood vessel constriction signals.
Post-meal & Heat
Symptoms may become more pronounced when blood flow concentrates in the digestive organs after eating or when blood vessels dilate due to heat.
Frequently asked questions
Does taking blood pressure medication cause orthostatic hypotension?
Some medications may have an effect, but the medication may not be the sole issue. Do not discontinue medication arbitrarily; inform your prescribing physician about when symptoms began and when medications were changed.
Is orthostatic hypotension a form of dysautonomia?
Autonomic dysfunction is one of the causes, but there are many other causes, including dehydration, bleeding, medications, and heart problems.
Can it occur in young people?
Yes. It can be caused by dehydration, insufficient food intake, medications, prolonged standing, or autonomic dysfunction, so it is not determined by age alone.
Sources
NHLBI — HypotensionSymptoms and causes of hypotension occurring upon standing, and fainting risks
American Autonomic Society/American Academy of Neurology Consensus Statement — Autonomic TestingComprehensive interpretation of tilt-table, Valsalva, deep breathing, and sweat tests
