Pain in the right lower abdomen accompanied by delayed menstruation should be distinguished from normal cases and abnormal cases. Normal cases are mainly caused by physiological factors, while abnormal cases are mainly caused by ectopic pregnancy, miscarriage, pelvic inflammatory disease or other diseases, which should be treated symptomatically after clarifying the cause. Common causes and treatment 1, physiological factors: negative urine pregnancy test, ultrasound examination does not indicate pregnancy and other abnormalities, most likely due to pelvic congestion, abdominal distension and pain, may be the imminent menstruation, this is a normal situation, no special treatment, observation can be; 2, psychological factors: mostly caused by excessive mental tension, if the menstruation is not normal, excessive mental tension, so that the psychological burden is too heavy, so that If the pain in the abdomen increases, you need to learn to adjust your mind and give yourself positive psychological hints; 3, ectopic pregnancy: if you have regular menstruation and unprotected sex, and you have pain in the lower right abdomen along with delayed menstruation, you are highly suspicious of the possibility of ectopic pregnancy, and it is recommended to go to the hospital for ultrasound and blood test for HCG to confirm the diagnosis; 4, miscarriage: if there is no ectopic pregnancy, but you have pain in the lower abdomen, you should consider that there are signs of miscarriage. If progesterone is low, it is generally believed that there is a sign of miscarriage and timely measures should be taken to preserve the pregnancy, which can be oral progesterone or intramuscular progesterone injection; 5. The phenomenon of inflammatory infection can be controlled by oral antibiotics or intravenous antibiotics to reduce abdominal pain; 6. Other: excluding the above factors, it may also be caused by appendicitis, intestinal obstruction, colitis and other diseases, which can be accompanied by fever, constipation, right lower abdominal pain and other discomfort, and the treatment is mainly surgical. Note: Patients are advised to avoid abnormal mood swings, eat reasonably, do not over diet, drink more hot water; live in moderation, do not stay up late, work and rest on time, and go to the hospital in time for any discomfort.