Different disorders: Appendicitis pain acute onset ; constant right lower abdomen. Usually person feels sick with fever of infection; medical emergency requiring immed surgery. Endometriosis pain is long-term, episodic, usually absent fever ; r or l. Endometriosis is a curious disorder not well understood. See my essays about endo linked to @doctorbadgley on twitter ; my pain syndrome board at quora.Com. See an md.
Answered 2/11/2014
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