Gastroesophageal Reflux Disease (GERD): This condition can cause gastritis, leading to symptoms like heartburn and abdominal pain. Sweating episodes could be related to the discomfort or pain associated with GERD, especially if the symptoms are severe or occur at night, disrupting sleep.

Peptic Ulcer Disease: Similar to GERD, peptic ulcers can cause gastritis and lead to symptoms such as abdominal pain, which might trigger sweating episodes due to pain or discomfort.
Functional Dyspepsia: This condition involves recurring signs and symptoms of indigestion that have no obvious cause. Stress and anxiety, which can be associated with functional dyspepsia, might lead to sweating episodes.
Irritable Bowel Syndrome (IBS): Although primarily affecting the bowel, IBS can sometimes cause upper gastrointestinal symptoms, including gastritis. The stress and discomfort from IBS could potentially lead to sweating episodes.

Pheochromocytoma: A rare tumor of the adrenal gland that can cause episodes of sweating, hypertension, and other symptoms. Gastritis could be unrelated but coincidental, or the stress from the condition might exacerbate gastrointestinal symptoms.
Hyperthyroidism: Can cause sweating, gastrointestinal symptoms, and potentially gastritis due to increased motility and acid production. Missing this diagnosis could lead to significant morbidity if not treated.
Myocardial Infarction or Acute Coronary Syndrome: Although less directly related to gastritis, sweating is a common symptom of cardiac events. Gastritis might be a coincidental finding or related to stress or medication use.

Zollinger-Ellison Syndrome: A rare disorder characterized by excessive gastric acid production leading to severe gastritis and peptic ulcers. Sweating could be associated with the pain or discomfort from these conditions.
Mastocytosis: A condition involving the accumulation of mast cells in various tissues, which can lead to a wide range of symptoms, including gastrointestinal issues like gastritis and episodes of sweating due to mast cell degranulation.
Neuroendocrine Tumors: Certain types can produce substances leading to flushing and sweating, and if they originate in the gastrointestinal tract, could also cause local symptoms like gastritis.