Appendicitis: This is often the most common cause of acute abdominal pain requiring surgical intervention in young females. The pain typically starts near the navel and then moves to the lower right abdomen. Appendicitis is an emergency and requires prompt treatment.

Ovarian Cyst Rupture or Torsion: These conditions are common in young women and can cause severe, sudden abdominal pain. Ovarian torsion is a surgical emergency.
Pelvic Inflammatory Disease (PID): This is an infection of the female reproductive organs that can cause lower abdominal pain, fever, and other symptoms. It's a common cause of abdominal pain in sexually active young women.
Gastroenteritis: Inflammation of the stomach and intestines, often due to a viral or bacterial infection, can cause abdominal pain, diarrhea, and vomiting.
Urinary Tract Infection (UTI): While more common in older women, UTIs can occur in young women and cause abdominal pain, especially if the infection involves the kidneys.

Ectopic Pregnancy: Although less likely in women using effective contraception, ectopic pregnancy is a life-threatening condition that must be considered in any female of childbearing age presenting with abdominal pain. Risk factors include previous pelvic surgery, history of PID, or assisted reproduction.
Ruptured Ectopic Pregnancy: This is a medical emergency requiring immediate surgical intervention.
Ovarian Hyperstimulation Syndrome (OHSS): This complication of fertility treatment can cause severe abdominal pain, vomiting, and fluid shifts, potentially leading to shock and death if not promptly recognized and managed.

Intussusception: A condition where a part of the intestine slides into an adjacent part, potentially causing bowel obstruction. It's more common in children but can occur in adults.
Mesenteric Ischemia: A rare condition caused by a reduction in blood flow to the intestines, which can lead to tissue death and is a surgical emergency.
Endometriosis: While not typically causing acute abdominal pain, endometriosis can lead to chronic pain and, in rare cases, acute pain if there is a rupture of an endometrioma.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause chronic abdominal pain but may also present acutely, especially if there is a complication such as a bowel obstruction or perforation.