The reason why it is hard to eat spinach in the stomach may be indigestion, food allergy, gastrointestinal diseases and so on. 1. Indigestion: Due to the high content of oxalic acid in spinach, when the human body has indigestion, the oxalic acid in spinach will stimulate the gastrointestinal mucosa, resulting in the symptom of stomach discomfort. 2. Food allergy: Although daily life to spinach allergy is relatively rare, but does not rule out the possibility, if you eat spinach in the stomach, itchy symptoms, then it is likely to be allergic to spinach, try not to eat spinach in the future, you can also go to the hospital to check the allergens to make it clear. 3. Gastrointestinal diseases: patients with gastrointestinal diseases, such as gastritis, gastric ulcer, enteritis, etc., will affect the digestive function of the stomach and intestines, food can not be digested in a timely manner, which will also cause symptoms of gastric distress. It is recommended that when the symptoms of gastric distress are severe, you should go to the hospital in time to find out the cause and under the guidance of the doctor for treatment.