What causes pain on the right side of the abdomen?

The causes of right-sided abdominal pain are complex and varied, potentially involving multiple systems. The main causes include: 1. Hepatobiliary system diseases: Such as acute cholecystitis, gallstones, liver cysts, and intrahepatic cholangitis. The pain typically occurs in the right upper quadrant of the abdomen and may be accompanied by symptoms such as nausea, vomiting, and jaundice. 2. Urinary system diseases: Such as right ureteral stones and urinary tract infections. The pain is often accompanied by symptoms such as frequent urination, urgency, and painful urination. 3. Gynecological diseases: Such as ovarian cyst torsion, right-sided adnexitis, and pelvic inflammatory disease. The pain is mostly located in the right lower quadrant of the abdomen and may be accompanied by changes in the menstrual cycle or menstrual flow. Due to the diverse causes of abdominal pain and the potential involvement of serious conditions, timely medical consultation is recommended to establish a clear diagnosis and receive appropriate treatment through professional examinations.