We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is Blood Viscosity?

Mary McMahon
By
Updated Mar 03, 2024
Our promise to you
The Health Board is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At The Health Board, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Blood viscosity is a measure of the thickness of blood. The thinner the blood, the less it resists flow, moving smoothly throughout the body. Some studies have linked moderate to high blood viscosity with cardiovascular problems and sometimes people can develop a medical condition known as hyperviscosity syndrome. In people with this condition, thickened blood leads to health problems ranging from visual anomalies to coma.

Several factors are involved in blood viscosity. The composition of the blood is one factor. The more fluid in the blood, the thinner it will be. High counts of red blood cells and particles lead to an increase in blood thickness. Fats that circulate in the blood can also play a role in making it thicker or thinner, with high concentrations of fats increasing viscosity.

Temperature is another contributing factor. As with many other fluids, in low temperatures, the blood becomes thicker and moves more sluggishly. This is a concern with frostbite, when chilling of the extremities can make the blood so viscous that it does not circulate and the tissue dies as a result of lack of oxygen and nutrients. Hypothermia can also lead to concerns about blood viscosity.

When the flow of blood is slow, cellular reactions that lead to adhesions can take place. Cells in the blood will start to stick together, forming clumps that thicken the blood. Viscosity also tends to increase in narrow blood vessels. People with conditions that lead to a slowing in flow rates or a narrowing of the vessels can be at risk for higher blood viscosity.

Unusually thick blood can potentially clot in the patient's veins, leading to health problems. High blood viscosity also forces the heart to work harder to pump the blood, increasing the risk that a patient's heart will give out.

If a patient has high blood viscosity, there are treatment options available. Medications can be prescribed to reduce the viscosity and break up any clots that may have formed. Patients with thickened blood due to exposure to extreme cold can be slowly warmed up to allow the blood to thin and bloodflow to normalize. It's important to be aware that the return of blood to areas with poor circulation can be painful. Although a patient may want to stop because of the unpleasant sensations, slow and steady warming should be continued until the blood flow normalizes and the patient is stable.

The Health Board is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a The Health Board researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments

By anon1004362 — On Jan 24, 2021

Excellent article, thank you.

By anon164117 — On Mar 30, 2011

I'm not sure if this is something that pertains to this, but I have a hard time giving blood. My veins end up closing down and I was told to make sure I was properly hydrated. Even when fasting you can drink up to 8 ounces of water. This was told to me at a lab I go to. I am always cold too, with a diagnosis of hypothyroid.

By upnorth31 — On Feb 21, 2011

Are blood viscosity and dehydration related? I would think that if there is more fluid in your body, there would be more fluid in your blood also.

I always have a hard time drinking enough throughout the day. I just don't think about it for some reason. It never occurred to me that it could result in problems with my blood.

By reader888 — On Feb 19, 2011

If one blood viscosity factor is temperature, like when frostbite or hypothermia is a problem, does having the temperature of your home too low present a risk? And if this is true, would it be a problem especially for people who may have a higher blood viscosity to begin with?

I know it saves money to keep the heat in your house set low, but I feel like it can't be healthy to be cold all the time.

Mary McMahon

Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
The Health Board, in your inbox

Our latest articles, guides, and more, delivered daily.

The Health Board, in your inbox

Our latest articles, guides, and more, delivered daily.