What causes semen to be viscous

Patient's question:

What causes semen to be thick? Why is semen sometimes thick and sometimes thin? Why does the same person's semen sometimes become very thick and sometimes very thin? It's quite substantial! Does this affect sexual life? Does this affect future fertility? What medical conditions can cause thick semen? Thank you all for your explanation.

Doctor's answer:

Hello! Freshly ejaculated semen is viscous, milky white, and contains grayish-white clumps. After about 10–20 minutes, the clumps liquefy on their own, turning into a translucent, cloudy, thin viscous fluid. The eyes cannot determine the quality of semen; it is recommended to go to the hospital for a semen analysis to confirm. Due to the inability to conduct a face-to-face examination, it is not possible to fully understand the condition. Specific diagnosis and treatment should be carried out at the hospital under the guidance of a doctor.

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