What does “thick blood” mean?

Many patients frequently refer to “thick blood,” but this is not a formal medical term. “Thick blood” refers to increased blood viscosity, medically termed “hyperviscosity syndrome.” It commonly affects middle-aged and elderly individuals and can be definitively diagnosed via hemorheological testing. So, what exactly is “thick blood”? Below, we provide an explanation.

What Is “Thick Blood”?

1. Inadequate Water Intake

Many people in daily life simply do not drink enough water. If the body fails to replenish fluids promptly and effectively, blood volume—and particularly plasma water content—decreases. Consequently, blood viscosity naturally increases, raising the risk of vascular occlusion.

2. Long-Term Smoking

Chronic heavy smoking contributes significantly to elevated blood viscosity. Prolonged exposure to tobacco smoke generates harmful substances that not only damage the lungs but also impair immune function. Moreover, tar, nicotine, and other toxic components from smoking adversely affect peripheral and systemic circulation.

3. Dietary Factors

Diet plays a major role in the development of hyperviscosity. Regular consumption of high-calorie, high-fat foods—especially combined with binge eating or excessive intake of strong tea or coffee—significantly increases the likelihood of developing thick blood.

4. Insufficient Physical Activity

Due to demanding work schedules, many people lack regular exercise, leading to reduced metabolic rate. As a result, metabolic waste products accumulate in the bloodstream and are not efficiently cleared, progressively increasing blood viscosity. Regular physical activity enhances metabolism and promotes the elimination of toxins from the body.

The above outlines what “thick blood” entails. We hope this information proves helpful to you.