Causes of Low Sperm Viability

The percentage of live sperm in a single drop of semen—normal male sperm viability typically exceeds 80%–90%. To assess sperm viability, men must abstain from ejaculation for 3–7 days prior to testing; standard semen analysis performed within this timeframe can accurately determine sperm viability. So, what causes low sperm viability?

Causes of Low Sperm Viability

Low sperm viability may result from the following factors:
1. Endogenous factors: such as varicocele, hyperprolactinemia, hypogonadism, and advanced age. The underlying cause should be identified and treated accordingly.
2. Exogenous factors: including environmental pollution, excessive physical or mental fatigue, smoking, and heavy alcohol consumption. Lifestyle modifications are recommended.
3. Inflammation: infections of the epididymis, seminal vesicles, or prostate gland can alter seminal plasma composition—including its pH, oxygen supply, nutrient content, and metabolic environment—thereby impairing sperm motility and survival.
4. Reduced semen volume, which correlates with decreased sperm motility.
5. Deficiency of trace elements, particularly zinc.
6. Mycoplasma infection: mycoplasma adheres to the sperm tail, compromising sperm motility.
7. Anti-sperm antibodies: leading to sperm agglutination or immobilization.
8. Abnormal semen liquefaction: resulting in reduced sperm motility.

To improve male sperm viability, adjustments to diet and lifestyle are essential—for example, increasing water intake, avoiding spicy and irritating foods, minimizing prolonged sitting, ensuring adequate sleep, maintaining a positive mental state, and managing stress effectively.

Smoking and alcohol consumption should be discontinued. Activities that elevate scrotal temperature—such as saunas, swimming, and hot spring bathing—should also be minimized, as elevated testicular temperature exerts direct cytotoxic and teratogenic effects on sperm. We hope this information proves helpful!