Old, unused sperm can cause semen to turn yellow. This is due to the breakdown and reabsorption of the sperm by the body. The color change is usually not a cause for concern, especially if it's been a long time since your last ejaculation. However, other factors can also affect semen color, including infections and the presence of urine.
Understanding Semen Color Changes
Several factors influence semen color. While a clear, white, or slightly grayish color is typical of healthy semen, variations can occur. These variations can be indicative of various underlying causes:
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Yellow Semen: As mentioned, yellow semen can be caused by old, unused sperm. This is a result of the natural breakdown process of sperm that the body reabsorbs. Other potential causes include dehydration, dietary factors, smoking, and medications. This is frequently mentioned across multiple sources [Cleveland Clinic, WebMD, YourDoctors.Online].
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Red or Pink Semen: Red or pink discoloration often indicates the presence of blood (hematospermia). This can be caused by injury, inflammation, or, rarely, more serious conditions [Mayo Clinic, HealthDirect, NHS]. The color may appear brownish if the blood is older, due to oxidation. [Healthline]
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Other Colors: Green or other unusual colors in semen can indicate infection [Mayo Clinic].
It is important to note that while yellow semen from old sperm is typically harmless, any significant or persistent color change should be investigated by a medical professional.
