What Causes Intermittent Pain in the Lower Left Abdomen?

Intermittent pain in the left lower quadrant of the abdomen—often referred to as left lower abdominal pain—can arise from a wide range of conditions, spanning gastrointestinal, genitourinary, gynecologic, and musculoskeletal systems. Because this region houses several vital structures—including the sigmoid colon, left ureter, left ovary and fallopian tube (in individuals assigned female at birth), and portions of the iliac vessels—accurate localization and clinical correlation are essential for diagnosis.

Gastrointestinal causes are among the most common. Diverticulitis—particularly involving the sigmoid colon—is a frequent culprit, especially in adults over 50 years of age. It typically presents with localized tenderness, low-grade fever, and sometimes constipation or diarrhea. Irritable bowel syndrome (IBS) may also manifest as crampy, intermittent discomfort relieved by bowel movements, often accompanied by altered stool frequency or consistency. Less common but important considerations include colonic ischemia, inflammatory bowel disease (such as ulcerative colitis or Crohn’s disease), and, rarely, colorectal malignancy—especially if associated with unexplained weight loss, rectal bleeding, or persistent change in bowel habits.

In individuals with ovaries, gynecologic etiologies must be carefully evaluated. Ovarian cysts—particularly when rupturing or undergoing torsion—can produce sharp, intermittent left lower quadrant pain, sometimes radiating to the groin or back. Endometriosis may cause cyclical pain that worsens around menstruation. Pelvic inflammatory disease (PID) can present with bilateral or unilateral lower abdominal discomfort, often accompanied by fever, vaginal discharge, or cervical motion tenderness on examination.

Urologic sources include left-sided kidney stones passing through the distal ureter, which commonly cause colicky, severe pain that may radiate to the groin and be associated with hematuria or dysuria. Urinary tract infection (UTI) involving the bladder or ureter may also provoke localized discomfort, particularly if inflammation extends into the pelvic peritoneum.

Musculoskeletal causes—such as strained abdominal wall muscles, hernias (e.g., inguinal or femoral), or nerve entrapment syndromes—are frequently overlooked but should be considered, especially when pain is exacerbated by movement or palpation of the abdominal wall.

Because intermittent left lower quadrant pain may signal anything from benign functional disorders to life-threatening conditions like ovarian torsion or complicated diverticulitis, prompt clinical evaluation is warranted—particularly if pain is worsening, persistent beyond 48 hours, associated with systemic symptoms (fever, vomiting, significant bleeding), or occurs in pregnancy. Diagnostic workup may include targeted physical examination, blood tests (CBC, CRP, urinalysis), pelvic ultrasound, CT imaging, or colonoscopy—depending on suspected etiology and patient-specific risk factors.