Functional Dyspepsia: This condition is characterized by recurrent upper abdominal pain or discomfort that is not exclusively relieved by defecation or associated with the onset of a bowel movement. The symptoms described, such as dull nonradiating generalized abdominal pain and dyspepsia after eating acidic or spicy foods, align closely with functional dyspepsia, especially given the absence of alarm features like weight loss, bleeding, or severe pain.

Gastroesophageal Reflux Disease (GERD): Symptoms of GERD can include dyspepsia and abdominal pain, especially after consuming acidic or spicy foods, which can exacerbate reflux.
Peptic Ulcer Disease: While peptic ulcers typically cause more localized pain, some patients may experience generalized abdominal discomfort, especially if the ulcer is in the duodenum or if there is associated inflammation.
Irritable Bowel Syndrome (IBS): Although IBS primarily affects bowel habits, some patients may experience abdominal pain and discomfort that could be generalized, especially if the predominant symptom is not clearly diarrhea or constipation.

Acute Coronary Syndrome: Although less common, abdominal pain can be a presenting symptom of a myocardial infarction, especially in women, diabetics, or the elderly. The absence of chest pain does not rule out cardiac ischemia.
Mesenteric Ischemia: This condition can present with generalized abdominal pain out of proportion to physical findings. It is crucial to consider in patients with risk factors such as atrial fibrillation, low cardiac output states, or previous vascular disease.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease or ulcerative colitis can cause generalized abdominal pain and tenderness, along with changes in bowel habits and possibly systemic symptoms.

Eosinophilic Gastroenteritis: A rare condition characterized by eosinophilic infiltration of the gastrointestinal wall, leading to abdominal pain, nausea, vomiting, and sometimes dyspepsia.
Celiac Disease: An autoimmune reaction to gluten, leading to small intestine inflammation and potentially causing abdominal pain, dyspepsia, and changes in bowel habits.
Abdominal Migraine: A condition that presents with recurrent episodes of severe abdominal pain, often accompanied by other migraine symptoms like headache or nausea, but can sometimes present with more generalized or dyspeptic symptoms.