Severe Abdominal and Pelvic Cramps: Differential Diagnosis and Red Flags

Severe cramping pain can arise from gynecologic, gastrointestinal, urologic, vascular, or musculoskeletal origins. Localization and associated symptoms guide diagnosis.

Gynecologic

• Primary dysmenorrhea: Cyclic, midline suprapubic, starts with menses. Prostaglandin-mediated.
• Endometriosis: Chronic pelvic pain, dysmenorrhea, dyspareunia, infertility. Implants outside uterus.
• Adenomyosis: Heavy, painful periods; diffusely enlarged, boggy uterus.
• Ovarian cyst rupture/torsion: Sudden unilateral pain, nausea. Torsion = surgical emergency.
• Ectopic pregnancy: Unilateral pain + vaginal bleeding + amenorrhea. Rupture → hemodynamic instability. Emergency.
• PID: Bilateral pain, fever, cervical motion tenderness, discharge.

Gastrointestinal

• Appendicitis: Periumbilical → RLQ migration, anorexia, nausea, fever. McBurney's point tenderness.
• Diverticulitis: LLQ pain, fever, leukocytosis (right-sided in Asian populations).
• SBO: Crampy pain, vomiting, distension, obstipation. Prior surgery = adhesions.
• IBS: Chronic abdominal pain related to defecation, bloating, altered stool form/frequency (Rome IV).

Urologic

• Nephrolithiasis: Colicky flank → groin pain, hematuria, nausea. Waves of intensity.
• Pyelonephritis: Flank pain, fever, CVA tenderness, dysuria.

Vascular

• AAA rupture: Sudden severe abdominal/back pain, hypotension, pulsatile mass. Emergency.
• Mesenteric ischemia: Pain out of proportion to exam, atrial fibrillation, vascular disease.

Red Flags – Immediate Evaluation

• Hemodynamic instability (hypotension, tachycardia, syncope).
• Peritoneal signs (rigidity, guarding, rebound).
• Pregnancy + pain/bleeding.
• Fever + severe pain.
• Hematemesis, melena, hematochezia.

Thorough history, focused exam, and targeted labs/imaging (CBC, β-hCG, urinalysis, CT, ultrasound) are essential.