How to determine if i pulled a muscle in my abdomen or is it something else?

History and physical: Generally a pulled muscle will have an associated incident, such as an impact injury, fall, etc. A pulled muscle should have localized and superficial pain, whereas intra-abdominal pathology generally will be deeper and may be more diffuse/vague. Do see a physician if symptoms persist.

Can be an abdominal: Cause, ie, from abdominal organs or the bowels/ spine if its not a pulled muscle. History of an injury or exertion like pulling/lifting something heavy could cause a pulled ms, while symptoms pertaining to other causes include nausea, vomiting, abd.Swelling, maybe fever, constipation/ diarrhea may occur. Pulled ms: hurt if its stretched. Bruising & tenderness will be present. So hx is important.