Why Do I Get Dizzy Standing Up With AL Amyloidosis?

Feeling very dizzy or like you might faint every time you stand up is a common sign of orthostatic hypotension—a sudden, significant drop in blood pressure when changing positions. In AL amyloidosis, this often occurs because abnormal amyloid proteins deposit into your nerves, disrupting the automatic signals that regulate your blood pressure ^[1]. When you stand, gravity pulls blood toward your legs. Usually, your body instantly tightens your blood vessels to maintain blood flow to your brain. If these nerves are damaged, blood pools in your lower body, reducing blood flow to the brain and causing severe dizziness ^[2].

Because standing dizziness can also result from heart rhythm problems, dehydration, or medication side effects, a doctor must confirm orthostatic hypotension with supervised blood pressure and heart rate measurements (a drop of at least 20 mmHg systolic or 10 mmHg diastolic within 3 minutes of standing) ^[3][4]. While this symptom can be frightening and severely limit your daily life, there are specific, evidence-based ways to manage it.

Immediate Safety and Urgent Care

If you feel dizzy when standing, sit or lie down immediately to prevent a fall. Do not try to “push through” it.
Seek emergency medical care if you experience:

• Actual fainting (loss of consciousness) or a fall
• Chest pain, new or severe shortness of breath, or sustained palpitations (a racing or irregular heartbeat) ^[4]
• Prolonged confusion or new neurologic symptoms

Contact your care team promptly if your near-fainting episodes are recurrent or worsening.

Why It Happens: Autonomic and Cardiac Factors

The autonomic nervous system controls automatic body functions. When amyloid deposits in the sympathetic ganglia (automatic blood pressure nerve centers) and small nerve fibers, it causes autonomic neuropathy (nerve damage) ^[1]. This damage slows or blocks the signals that tell your blood vessels to constrict when you stand ^[2].

Additionally, AL amyloidosis can involve the heart, leading to a stiffened heart muscle ^[5]. A stiff heart limits your body’s ability to increase cardiac output (the amount of blood pumped) to compensate for the blood pooling in your lower body ^[6]. Autonomic and cardiac issues often overlap in AL amyloidosis, making careful evaluation essential ^[6].

Actionable Management Strategies

The goal of treating nerve-related (neurogenic) orthostatic hypotension is to reduce symptoms and prevent falls, rather than achieving a perfectly normal blood pressure number ^[7][8].

Physical Maneuvers and Safe Exercise
Because your automatic reflexes are impaired, you can use physical techniques to help your body adjust:

• Make slow transitions: Sit on the edge of the bed for a few minutes before standing, and stand still while holding a sturdy object before walking.
• Use muscle pumping: Cross your legs tightly, pump your calf muscles, or bend forward slightly before and during standing. Activating your leg muscles physically pushes blood back up toward your heart ^[9].
• Exercise safely: Avoiding prolonged bed rest is important, but standing exercise can be dangerous if you are prone to fainting. Try seated or recumbent (lying down) exercises, such as a stationary recumbent bike, and always exercise with supervision ^[10]. Avoid exercising in water unless cleared by your doctor, as immersion and exiting the water can cause unsafe blood pressure drops.

Compression Garments
External compression acts as an artificial blood pressure regulator by physically squeezing the abdomen and legs to prevent blood from pooling.

• Abdominal binders: Elastic abdominal binders have strong evidence for improving neurogenic orthostatic hypotension and are often more effective than leg stockings ^[11].
• Compression stockings: Standard knee-high stockings have little effect on standing blood pressure ^[12][11]. If stockings are used, they generally must be waist-high to provide meaningful support, but they can be exhausting to put on. Ensure any garment is properly fitted and approved by your doctor, especially if you have fragile skin or abdominal swelling.

Hydration and Salt: Proceed with Caution
For typical orthostatic hypotension, doctors often recommend increasing water and salt to boost blood volume ^[13]. However, do not substantially change your salt or fluid intake without a clinician-set plan. In AL amyloidosis, if you have cardiac involvement or kidney disease, excess fluid and salt can cause severe congestion, swelling, and worsening shortness of breath ^[5].

Medications
When lifestyle measures are not enough, doctors may prescribe medications. Evidence for these drugs generally comes from studies of neurogenic orthostatic hypotension, requiring careful monitoring when applied to AL amyloidosis.

• Midodrine and Droxidopa: These are the standard medications used to constrict blood vessels and raise standing blood pressure ^[14][11]. They require careful, individualized dosing. Because they raise blood pressure, they can cause supine hypertension (high blood pressure when lying flat) ^[14]. To manage this risk, these medications should not be taken close to bedtime, and you may need to remain upright for a certain period after a dose ^[15].
• Fludrocortisone: This medication helps your body retain salt and water to expand blood volume ^[16]. However, it is usually avoided or requires extreme caution if you have symptomatic heart failure or significant kidney disease, as it can cause dangerous fluid overload ^[16][8].

Managing Supine Hypertension
Many patients with autonomic neuropathy have low blood pressure when standing but high blood pressure when lying flat ^[8].

• If you feel dizzy, lie down immediately to prevent a fall, even if supine hypertension is a concern.
• However, when you are not having symptoms, avoid prolonged flat rest during the day.
• Sleep with the head of your bed elevated by 8 to 12 inches (20–30 cm). This reduces nighttime supine blood pressure and helps prevent overnight fluid loss, often improving morning dizziness ^[10][17].

Keeping a Log
Work with your doctor to establish a safe way to monitor your blood pressure. Keeping a daily log of your seated and standing blood pressure, heart rate, symptoms, medication timing, and meals can help your team adjust your care plan safely ^[7]. Ensure you only check standing blood pressure if you have a safe setup and someone nearby to assist you.