May 6, 2026 - The term refers to three sets of symptoms that mean your blood is so thick it can’t flow freely through blood vessels. Learn why treatment matters.

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April 27, 2025 - This is a group of rare syndromes in which white blood cells attack healthy cells. This disruption leads to hyperviscosity. Hyperviscosity can affect your entire body. The symptoms of hyperviscosity can look very different depending on the cause of the syndrome. Some of the symptoms manifest as: ... Hyperviscosity is treated by a team of specialists, including a hematologist, nephrologist, oncologist, internist, and intensivist. It is technically classified as a medical emergency and it is vital to treat it quickly.

April 1, 2026 - Eye exams can reveal sausage-shaped veins in your retina, a telltale sign of hyperviscosity. While routine blood panels can show clues like elevated red blood cells or abnormal proteins, specialized viscosity testing is needed for confirmation.

July 27, 2026 - Hyperviscosity syndrome (HVS) refers to the clinical sequelae of increased blood viscosity. Increased viscosity slows the flow rate of blood across vascular beds, leading to inadequate tissue perfusion and consequently multi-organ dysfunction. High blood viscosity usually results from increased circulating serum immunoglobulins due to such diseases as Waldenström macroglobulinemia (WM) and multiple myeloma.

September 22, 2025 - Plasmapheresis may be used to decrease viscosity in the case of myeloma, whereas leukapheresis or phlebotomy may be employed in a leukemic or polycythemic crisis, respectively. Blood transfusions should be used with caution as they can increase serum viscosity.

March 29, 2026 - Three categories of symptoms appear ... viscosity worsens, patients may experience difficulty hearing, unsteadiness, seizures, or even stroke-like episodes and loss of consciousness....

December 22, 2025 - Symptoms reflect microcirculatory hypoperfusion and reduced tissue oxygenation due to stasis of hyperviscous blood or thrombosis in the venous/arterial circulation (typically in polycythemia vera).

This leads to sluggish blood flow, endothelial cell damage, and impaired microvascular perfusion, resulting in tissue hypoxia and bleeding. In addition to the impact on blood viscosity, the increased circulating proteins can affect platelet ...

Hyperviscosity Syndrome (HVS) is a medical condition characterized by an increased viscosity (thickness) of the blood, which can lead to various health complications. This syndrome is significant because it can affect blood flow, leading to ...

February 8, 2019 - In adults, hyperviscosity syndrome typically causes symptoms when blood viscosity is between 6 and 7, measured relative to saline, but it can be lower.

November 28, 2024 - This condition often shows itself through a combination of symptoms affecting the skin, brain, and vision. Common signs are bleeding from the skin or moist surfaces in the body, like a bloody nose, bleeding gums, or gastrointestinal bleeding.

Hyperviscosity syndrome in myeloma ... centipoise (1.56 to 1.68 cp) has been associated with symptoms.76,77 The clinical signs are bleeding, visual signs and symptoms, and delirium....

September 27, 2018 - Whole-blood hyperviscosity is seen in patients with extreme elevation of the red cell and white cell count. Phlebotomy of patients with primary and secondary elevation of the red cell count is a well-established therapy.

May 13, 2026 - Symptoms of hyperviscosity can appear with a serum viscosity as low as 3 cp but usually arise when it exceeds 4 to 5 cp.[9][10][11] Further testing should include a complete blood count, full serum chemistries, coagulation profile, and urinalysis. An elevated albumin-protein gap and significant proteinuria on routine urinalysis suggest an underlying gammopathy.

August 26, 2024 - Symptoms can include fatigue, chest pain, shortness of breath, and frequent headaches. If you're experiencing these symptoms, it could be a sign of an underlying cardiovascular issue, and it's crucial to seek medical attention immediately.

Clinically, the concern is increased blood viscosity, which may occur when the blood contains more cells (especially red cells), more plasma proteins, and/or less plasma (the liquid portion of blood). Higher viscosity can contribute to circulation problems and, in some settings, increase thrombotic risk—so persistent abnormalities should be assessed in medical context rather than self-interpreted.

Recurring nosebleeds, headaches, and visual disturbances are common symptoms in patients with symptomatic hyperviscosity.16 Funduscopy is an important indicator of clinically relevant hyperviscosity. Among the first clinical signs of hyperviscosity are the appearance of peripheral and midperipheral ...

July 3, 2016 - Other investigations to determine the underlying cause include bone marrow aspiration, urine electrophoresis, auto-antibody levels. Patients with a hyperviscosity syndrome should be advised that this may recur; they should be advised to look ...

July 27, 2026 - Workup: Hyperviscosity syndrome (HVS) refers to the clinical sequelae of increased blood viscosity. Increased serum viscosity usually results from increased circulating serum immunoglobulins and can be seen in such diseases as Waldenström macroglobulinemia and multiple myeloma.