There are many reasons why men have pain in the lower right abdomen when pressed, the most common causes to consider appendicitis, other intestinal diseases, urinary system diseases and so on. 1. Acute appendicitis: for example, acute appendicitis or chronic appendicitis, and the typical symptoms of metastatic lower right abdominal pain, often accompanied by nausea, vomiting, diarrhea, fever and other symptoms. The right lower abdomen may show obvious pain and rebound pain when pressed. 2. Other intestinal diseases: for example, colitis, intussusception, colon cancer, etc., patients will feel abdominal pain, and pain will appear when pressing the right lower abdomen. 3. Urological diseases: such as ureteral stones, cystitis, nephritis can also lead to pain in the lower right abdomen, but generally accompanied by low back pain, urinary tract irritation signs, if the right side of the ureter stones, will be accompanied by abdominal colic symptoms, when pressed will also show pain reflex. The cause of pain in the lower right abdomen is very complex, and it is necessary to consult a doctor in a timely manner, the doctor will combine the patient’s accompanying symptoms, improve the relevant examination, clarify the cause of the disease, so as to systematic treatment.