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It is rare for someone to have no reason for chronic pain.
Inguinal hernias can cause pain with sitting, especially leaning forward, such as behind a desk or at a dinner table.
If you indeed have an inguinal hernia as the cause of your pain, CT may be normal or perhaps it was misread. I often move on to an MRI if the history and examination are suggestive of an inguinal hernia, since CT can miss the small inguinal hernias.