Many different things can cause urethritis. Urethritis is commonly due to sexually transmitted infections (STIs), also called sexually transmitted diseases (STDs). There are different types of urethritis, each with different causes:
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Gonococcal urethritis (GCU): This is urethritis that is caused by gonorrhea, specifically the bacteria Neisseria gonorrhoeae.
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Nongonococcal urethritis (NGU):Chlamydia trachomatis is the most common nongonococcal cause of urethritis.
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Non-specific urethritis (NSU): This is urethritis that is not due to a gonorrhea or chlamydia infection.
Other bacteria that can cause urethritis are:
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Escherichia coli (E. coli)
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Mycoplasma genitalium
Viruses can also cause urethritis, but this is less common. The most common virus that causes urethritis is the herpes simplex virus (HSV). HSV is the same virus that causes genital herpes, a sexually transmitted infection.
These bacteria and viruses can pass from an infected person to the next during sexual intercourse. The following sexually activity puts people at higher risk of getting urethritis:
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Having multiple sexual partners
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Having unprotected sex
Other non-infectious causes of urethritis include:
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Trauma: This can be due to having instruments in the urethra, such as a urinary catheter.
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Irritation: This can be from items such spermicides or personal lubricants.