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A 46-year-old male asked:

Can having thick blood, a term my dr used, be the reason that i am constantly fatigued?

1 doctor answer2 doctors weighed in
Dr. Silviu Pasniciuc
Internal Medicine 27 years experience
Yes: Thick blood is commonly referring to polycytemic patients, patients with high hematocrit/hemoglobin that increases the blood viscosity. Most of the time this condition is secondary to a different medical condition, for example lung disease. If healthy otherwise, ask your doc if donating blood would help you thin your blood.

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Last updated May 10, 2015

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