Lower Abdominal Pain and Back Cramping: Early Pregnancy Sign or Other Conditions Like UTI, IBS, or Ectopic Pregnancy?

Lower abdominal pain and back cramping are nonspecific. In reproductive-age women, the differential includes:

Gynecologic

• Normal ovulation (mittelschmerz).
• Early intrauterine pregnancy (implantation, uterine stretching).
• Ectopic pregnancy — unilateral pain, vaginal bleeding, +hCG; rupture = surgical emergency.
• Ovarian cyst (hemorrhagic, torsion).
• Endometriosis (cyclic).
• PID (cervical motion tenderness, fever, discharge).
• Uterine fibroids (degeneration).

Urologic

• UTI (dysuria, frequency, urgency, suprapubic pain).
• Ureteral stone (colicky flank → groin pain, hematuria).

Gastrointestinal

• Constipation, gas, IBS.
• Diverticulitis (LLQ, fever, leukocytosis).
• Appendicitis (migrates to RLQ).

Musculoskeletal

• Lumbar strain, sacroiliac joint dysfunction.

Workup

Urine hCG → if +, TVUS for location/viability. Urinalysis, CBC, CRP. Pelvic US for adnexal/uterine pathology. CT if surgical abdomen suspected.

Never ignore unilateral pain + positive pregnancy test — rule out ectopic immediately.