
What Causes Unpleasant Sensation Under Right Rib While Sitting?

Simple intercostal muscular strain
Detailed Answer:
Hello. I have been through your question and understand your concern.
To begin with, there are only two condition which symptoms are manifested with disesthesia(different sensation) of a specific dermatome which you explain with sensation under the rib.
The first one is a subclinical herpes zoster infection, which MUST be associated with vescicles in the skin of the impaired sensation.
The second one is a compression of the thoracic nerve at the level of the vertebras. In this case a plain Xray of the thoracic vertebras is enough to rule out any eventual problem.
BUT, these are very rare, and I think you are just experiencing an intercostal muscular strain ( muscle injury) which is very common, totally benign and resolving in a few days with no treatment. This is explained by you additional feature reporting an increase of this sensation when you are sitting, because an increase of your abdominal pressure ( when sitting) puts your intercostal muscle do the respiration because the diaphragm no longer assist in sitting position.
This is my diagnosis. Hope it helps.
Wish you the best health.

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