Upper abdominal pain
Note: if the patients' predominant symptom is pain, it may not be attributable to delayed gastric emptying
Ref:
Uptodate
[ Etiology and diagnosis of delayed gastric emptying]
Harrison
[ 257]
ACG Gideline
[ https://journals.lww.com/ajg/Fulltext/2013/01000/Clinical_Guideline__Management_of_Gastroparesis.8.aspx]