Testicular pain could be a rare sign of coronavirus, doctors have claimed.
It comes after a 49-year-old man in Turkey tested positive for Covid-19 with no other symptoms.
The patient sought medical advice because of swelling and pain in the left side of his groin and testicles in the summer.
He did not have any of the recognised symptoms of the virus, such as a persistent cough, high temperature and a loss or change to the sense of taste or smell.
But doctors decided to swab him for the disease because he had been in contact with someone who had later tested positive.
The results showed he had Covid-19 and doctors suspected his testicular pain was his first symptom. They said he did not have any other health problems that could have caused the pain and did not have an STI.
Doctors who reported the "unusual case" in a medical journal said it shows how the coronavirus can take hold in people differently.
It is not clear how many men suffer this particular pain as a symptom of the virus but a small study in China suggested it could be as common as one in five.
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Scientists are concerned the virus could enter the testicles, where sperm is produced, and cause "long-term damage". But there is so far little concrete evidence of this happening.
The case was reported in the medical journal Urology Case Reports by doctors at Acıbadem Mehmet Ali Aydinlar University in Istanbul.
Dr Hakan Özveri said the man's testicular pain appeared to be the "first clinical sign of Covid-19".
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After a few hours, it became more severe and spread further up to his stomach.
Dr Özveri and his team wrote: "Covid-19 is a viral infection which predominantly attacks (the) respiratory organs.
"However, as in our case, patients can exhibit various symptoms in organs other than the lungs, such as in genitals.
"Patients with isolated genital symptoms such as testicular/spermatic cord pain and discomfort without other systemic symptoms should be closely followed for Covid-19."
It's not clear just how common the problem is because there have been no large-scale studies of both mild and seriously ill Covid-19 patients.
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