Harder abdomen and constipation may be caused by physiological factors such as diet and medication, as well as pathological factors such as intestinal diseases, craniocerebral diseases and systemic diseases. 1. Physiological factors: If you have recently eaten too much fried, sweet, high-fat and other difficult-to-digest food, or overeating and other behaviors, it will lead to an increase in intestinal stools and dryness, constipation, so that the abdomen feels hard to the touch. Certain medications, such as antiepileptic drugs, diuretics, antidiarrheal drugs, non-steroidal anti-inflammatory drugs, etc., may cause constipation, which will also make the abdomen hard. 2. Intestinal diseases: such as intestinal dysbiosis, dyspepsia, intestinal obstruction, megacolon, intestinal tumors, etc., which can lead to abnormal intestinal peristalsis and digestive function, constipation, and make the abdomen feel hard to touch. 3. Craniocerebral diseases: such as autonomic neuropathy, cerebral hemorrhage, cerebral infarction and other diseases, may also cause constipation, resulting in stool collection in the intestinal lumen, making the abdomen feel harder. 4. Systemic diseases: such as diabetes mellitus, hypothyroidism and other diseases, will lead to the body’s metabolism decline, affecting the normal function of the intestinal tract, constipation, making the abdomen hard. If patients have long-term or repeated symptoms of abdominal hardness and constipation, it is recommended to seek timely medical treatment to identify the cause of the disease and carry out targeted treatment to avoid delay.