Gastroesophageal Reflux Disease (GERD): This condition is characterized by stomach acid frequently flowing back into the tube connecting the mouth and stomach (esophagus). The spasm feeling in the upper mid abdomen could be due to the irritation of the esophagus or the stomach lining, leading to muscle spasms.

Peptic Ulcer Disease: Ulcers in the stomach or the first part of the small intestine (duodenum) can cause abdominal pain and spasms, especially if they are bleeding or perforated.
Gastritis: Inflammation of the stomach lining can lead to pain, nausea, and spasms in the upper abdomen.
Functional Dyspepsia: A condition characterized by recurring signs and symptoms of indigestion that have no obvious cause, which can include spasms in the upper abdomen.

Myocardial Infarction (Heart Attack): Although less common, myocardial infarction can present with epigastric discomfort or a feeling of spasm in the upper mid abdomen, especially in women or diabetic patients.
Pulmonary Embolism: In rare cases, a pulmonary embolism can cause referred pain to the upper abdomen, which might feel like spasms.
Aortic Dissection: A serious condition where the inner layer of the aorta tears, which can cause severe, tearing chest pain that might radiate to the abdomen.

Pancreatitis: Inflammation of the pancreas, which can cause severe abdominal pain, might also present with spasms in the upper mid abdomen.
Cholecystitis: Inflammation of the gallbladder can cause right upper quadrant pain but might occasionally be felt more centrally, especially if the gallbladder is inflamed and irritated.
Hernias: Hiatal hernias or other abdominal wall hernias can cause intermittent abdominal pain or a feeling of spasm, especially if they become incarcerated or strangulated.