Causes of pain in the right side of the abdomen mainly include liver diseases, digestive diseases, emotional factors, respiratory muscle spasms and so on. 1. Liver diseases: such as hepatitis, when inflammatory reaction occurs inside the liver, pain may appear when it spreads to the right side of the abdominal wall; when liver cancer occurs, liver tissues may be destroyed by tumor cells, resulting in pain. 2. Other gastrointestinal diseases: such as appendicitis, the pain will radiate to the corresponding right lower abdomen, and there will be obvious pressure and rebound pain at the Mai’s point of the abdominal wall (at the intersection of the navel and the middle and outer one-third of the line of the right anterior superior iliac spine). 3. Emotional factors: patients may also suffer from unexplained abdominal wall pain when they are emotionally agitated. 4. Respiratory muscle spasm: when the patient suddenly and vigorously exercise, the body can not keep up with the rhythm of movement, respiratory spasm can occur, resulting in the patient’s right abdominal pain, which is commonly known as the fork in the air. 5. Female patients with right abdominal pain may also be the right side of the ovary or uterus disease, must do ultrasound examination to clarify the diagnosis. This symptom may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.