To my knowledge, the connection between extended periods sitting and/or straining is anecdotal. Not saying it's not true - it probably is - but it isn't proven.

To my knowledge, the connection between extended periods sitting and/or straining is anecdotal. Not saying it's not true - it probably is - but it isn't proven. On the other hand, there are proven, more ominous, but fortunately less-common causes of hemorrhoids, such as tumors and cirrhosis.