Differential Diagnosis for Foul Smell from Penis
Single Most Likely Diagnosis
- Smegma: This is the most likely cause of a foul smell from the penis, especially if the individual has not been circumcised or has poor genital hygiene. Smegma is a substance that can accumulate under the foreskin and cause a strong odor.
Other Likely Diagnoses
- Urethritis: As mentioned in the question, urethritis (inflammation of the urethra) can cause a foul smell from the penis, especially if it's caused by a bacterial or fungal infection.
- Balanitis: This is an inflammation of the glans penis, which can cause a foul smell, redness, and itching.
- Poor Genital Hygiene: Not practicing good genital hygiene can lead to the accumulation of sweat, bacteria, and other substances that can cause a foul smell.
Do Not Miss Diagnoses
- Gonorrhea or Chlamydia: These sexually transmitted infections (STIs) can cause urethritis and a foul smell from the penis. It's essential to consider these diagnoses to prevent long-term complications and transmission to others.
- Diabetic Ketoacidosis: Although rare, diabetic ketoacidosis can cause a foul-smelling discharge from the penis due to the high levels of ketones in the body.
Rare Diagnoses
- Penile Cancer: Although extremely rare, penile cancer can cause a foul smell from the penis, especially if it's advanced.
- Foreign Body in the Urethra: Insertion of a foreign object into the urethra can cause a foul smell, infection, and other complications.
- Zinc Deficiency: Some studies suggest that zinc deficiency can contribute to a foul smell from the penis, possibly due to its role in maintaining healthy skin and mucous membranes.