Left Lower Quadrant Pain Before Period: Causes from Ovulation to Ectopic Pregnancy

Sharp Left-Sided Abdominal Pain 4 Days Before Menses: Differential Diagnosis

New-onset sharp left lower quadrant (LLQ) pain in the late luteal phase warrants evaluation. Common causes:

Gynecologic

• Ovulation pain (mittelschmerz): Usually mid-cycle (day 14), but can be late; unilateral, sharp, brief.
• Premenstrual cramps: Prostaglandin-mediated uterine contractions; often central/suprapubic but can radiate.
• Ovarian cyst: Hemorrhagic corpus luteum cyst → sudden sharp pain if ruptures/bleeds.
• Endometriosis: Cyclic pain, dyspareunia, infertility; left-sided implants common.
• Ectopic pregnancy: LLQ pain + amenorrhea + vaginal bleeding → RUPTURE RISK. Emergency.

Non-Gynecologic

• Diverticulitis: LLQ pain, fever, leukocytosis (more common >40).
• Ureteral stone: Colicky flank→groin pain, hematuria.
• Appendicitis: Rarely presents as LLQ (situs inversus, long appendix).
• IBS/constipation: Bloating, altered bowel habits.

Red Flags → Immediate ER

• Severe pain, hypotension, shoulder tip pain (diaphragmatic irritation).
• Fever >38°C, vomiting, inability to pass stool/gas.
• Positive pregnancy test with pain.

Next Steps

1. Pregnancy test (urine hCG) now.
2. If negative but pain persists/worsens → clinician for exam, possibly pelvic ultrasound, urinalysis, CBC.
3. Track pain pattern relative to cycle for next visit.