Diclofenac tablets its main active ingredient is diclofenac sodium, this ingredient can inhibit the synthesis of prostaglandins in the body, so as to alleviate and reduce the symptoms of pain caused by various reasons. Since prostaglandin is a substance with obvious protective effect on gastrointestinal tract, which can inhibit the secretion of gastric acid and also stimulate the secretion of digestive juices, taking Diclofenac tablets will obviously cause gastrointestinal irritation symptoms, such as gastric acidity, gastric distension, acid reflux, heartburn, and even nausea, vomiting, and so on. So patients with gastrointestinal diseases, such as upper gastrointestinal bleeding or severe gastric ulcer patients are best not to take. Prostaglandins also have the effect of lowering blood pressure and dilating blood vessels, and the inhibition of prostaglandins after taking Diclofenac tablets will lead to the onset of cardiovascular and cerebral vascular diseases, especially infarction diseases.