Usually, the 160,000 kilometers of blood vessels in your body work incredibly smoothly. However, the forces of age, weight gain, and gravity can conspire to cause lumpy varicose veins.

Hosted by: Michael Aranda
———-
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
———-
Dooblydoo thanks go to the following Patreon supporters—we couldn’t make SciShow without them! Shout out to Jeremy Peng, Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Benny, Kyle Anderson, Tim Curwick, Scott Satovsky Jr, Will and Sonja Marple, Philippe von Bergen, Bella Nash, Bryce Daifuku, Chris Peters, Saul, Patrick D. Ashmore, Charles George, Bader AlGhamdi
———-
Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow
———-
Looking for SciShow elsewhere on the internet?
Facebook: http://www.facebook.com/scishow
Twitter: http://www.twitter.com/scishow
Tumblr: http://scishow.tumblr.com
Instagram: http://instagram.com/thescishow
———-
Sources:
https://www.circulationfoundation.org.uk/help-advice/veins/varicose-veins-endovenous-laser-therapy
https://www.fi.edu/heart/blood-vessels
http://www.bbc.co.uk/schools/gcsebitesize/science/21c/keeping_healthy/heartdiseaserev2.shtml
http://www.mayoclinic.org/diseases-conditions/varicose-veins/symptoms-causes/dxc-20178128
http://www.nhs.uk/conditions/Varicose-veins/Pages/Whatarevaricoseveins.aspx
https://www.circulationfoundation.org.uk/help-advice/veins
https://www.womenshealth.gov/publications/our-publications/fact-sheet/varicose-spider-veins.html#E
http://search.proquest.com/openview/056a60d02a64d891a387978bb5ddd6f4/1?pq-origsite=gscholar
http://www.hopkinsmedicine.org/healthlibrary/conditions/cardiovascular_diseases/varicose_veins_85,p08259/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3920493/
https://www.ncbi.nlm.nih.gov/pubmed/8616659

Why Do I Have Varicose Veins?

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>