As a child I was told that sitting on cold concrete can cause kidney problems and hemorrhoids. Is that true or an old wives tale?
This one is an old wive's tale. Hemorrhoids are caused most often by straining during a bowel movement. This puts excessive pressure in the veins of the rectum causing them to swell. Sitting for long periods of time can also lead to hemorrhoids, but you would have to be on the concrete for quite some time for this to occur.
I know you asked this a long time ago, but I wanted to make sure you received information if you had not already.
For more information, you might check out these articles:
Hope you are well!