Right-sided abdominal pain is often due to the following reasons: First, appendicitis, when the patient has obvious pain in the right lower abdomen, it is often the disease, usually with pressure pain, some patients with rebound pain and muscle tension. It can be clarified by checking blood routine, C-reactive protein, abdominal ultrasound, and abdominal CT. Secondly, if the right side of the abdomen is outside, there may be urinary stones and urinary tract infection, need to check the urinary tract ultrasound and urine routine for clarification. Third, there may be cholecystitis combined with gallbladder stones, the disease is usually the right upper abdominal pain, sometimes distension, sometimes colic. You can check the liver and gallbladder ultrasound, or CT of the upper abdomen to make it clear. Fourth, there are some female patients with pain in the lower abdomen, often considered gynecological diseases, such as ovarian cyst torsion, rupture of ovarian cysts, or ectopic pregnancy.