It is also important to consider the presence or absence of accompanying medical issues in order to precisely identify the cause and to help formulate the optimal treatment for pain in the buttocks.
The abdominal cavity contains the stomach, intestines, liver, gallbladder, kidneys, spleen and pancreas. Side pain can be a symptom of a wide variety of mild to serious diseases, disorders and conditions, such as infection, infarction, inflammation, indigestion, trauma, intestinal obstruction, and cancer.
The most common cause of abdominal pain for a woman with a regular menstrual cycle is abdominal cramps; however, you mention that you are not on your period right now. The other causes of one sided abdominal pain in a woman are conditions affecting the ovaries such as cysts or torsion. They can cause one sided abdominal pain or cramping. Another possibility is a urinary tract infection. A urinary tract infection can migrate up the the kidneys and cause one sided back pain. It is also usually associated with fevers. Another possibility is constipation.