What causes lower abdominal pain?

For three months, I have had pain in the lower abdomen. At first a doctor said the pain was resulting from an infection which had not been treated effectively. Recently, a scan revealed I had a branch-like swelling on my right ovary.

QDear Doctor, 
 
For three months, I have had pain in the lower abdomen. At first a doctor said the pain was resulting from an infection which had not been treated effectively. Recently, a scan revealed I had a branch-like swelling on my right ovary. 
 
I was given medicine, though I did not improve. But I was advised to go back for a scan after finishing the medication. When I went back, the swelling, which had earlier been measured in centimetres was taken in millimeters, which confused me further. 
 
I was given more medication to treat the infection. What could I be suffering from? 
Anonymous
 
ADear Anonymous,
You should ask the doctor who diagnosed your condition about the nature of the infection. It is important for patients to discuss their health with a doctor. This satisfies both parties and helps the patient get proper treatment. 
 
Possible causes of lower abdominal pain include appendicitis (inflammation of the appendix), bladder inflammation and diverticulitis (digestive disease, particularly in the large intestine). 
 
Others are ectopic pregnancy (this occurs outside the womb), endometriosis (a condition in which the cells from the lining of the uterus flourish outside the uterine cavity) and intestinal obstruction (a blockage of the bowel that prevents the contents of the intestines from passing through). 
 
Ovarian cysts, pelvic inflammatory diseases and inflammation of the fallopian tubes can also cause lower abdominal pain. 
 
Seek medical attention, but meanwhile, ensure you eat smaller meals, especially if the pain is accompanied by indigestion. Also, avoid over-the-counter medication.