If you have pineapples, you should consider the following reasons. 1. if you have eaten too much pineapple, pineapple contains more acidic substances, if you eat too much, it will be a burden to the gastrointestinal tract and you will also have abdominal pain. 2. if you take pineapple on an empty stomach, because of its acidic substances, the stimulation of the gastrointestinal tract is more obvious in the case of an empty stomach and you will also have abdominal pain. 3. The most important thing is that the pineapple itself also has a medical substance called bromelain, and some patients have a special constitution that may cause abdominal pain because of the allergic reaction of bromelain to the body after eating pineapple. In addition to abdominal pain, the patient may also have a rash, itchy skin, or even chest tightness and breathlessness, to rush to the hospital. If you have abdominal pain after eating pineapple, you can consider drinking warm water and applying hot towels or hot water bags to your abdomen at the same time. If the symptoms continue to not improve, go to the hospital to rule out if you are allergic.