Last week there was an article in the Sun which states that too much sex can cause carpal tunnel syndrome.
The Sun referred to an article in a medical journal called Medical Hypotheses. Unfortunately, the journal journal isn't one which is peer-reviewed and so anything can be published in it, including articles by AIDS denalists.
The Sun doesn't link to the article in question – nor is it even named – but it appears to be the one entitled "The role of sexual intercourse in the etiology of carpal tunnel syndrome".
Unfortunately, I am unable to obtain the full article, but the journal in which it is published, says a lot about its credibility.
UPDATE: Via the comments, I have been emailed me a PDF copy of the article in question. After looking through the article, I don't see anything which causes me to change my views on the credibility of the article. In my view, if there was something there, it would have been published in a more-credible journal...