There are many causes of pain in the small of the left side of the abdomen in women, which may be intestinal or urinary, gynaecological or caused by a retroperitoneal mass. Common diseases include acute pancreatitis, intestinal obstruction, ulcerative colitis, ectopic pregnancy rupture, corpus luteum rupture, and ovarian tumour torsion. The specific disease needs to be determined by the nature and location of the pain and the relevant tests and findings. In addition, eating cold food or getting a chill in the abdomen can occasionally cause left abdominal pain, which is mostly not a disease.