Thank you for the query.
Possibilities are an irritable bowel syndrome
, inflammatory bowel disease
very rarely lupus involving the bowels. Worthwhile getting colonoscopy
and if required endoscopy done. Also getting thyroid function tests
done will help.
Lupus uncommonly involves the bowel and can present with diarrhea. But this is associated with multiple other lupus symptoms like joint pain, skin rash etc.
Hope this answers your query.
Wish you a speedy recovery.