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Urgent & emergency

Severe Lower-Right Abdominal Pain: Is This an Emergency?

Sudden, severe pain in the lower right abdomen is an emergency until proven otherwise — go to the ER without waiting to see if it improves. Appendicitis, ectopic pregnancy, and ovarian torsion all cause pain in this area and can become life-threatening. Call 911 if you faint, cannot move, or are pregnant.

Why does this belong in the emergency room?

The lower right abdomen holds the appendix, the end of the small intestine, and — in people with ovaries — the right ovary and fallopian tube. Several conditions that cause severe pain here can progress to a surgical emergency within hours.

Appendicitis is the most common single cause of new severe lower-right pain. The risk of perforation increases significantly after 36 to 48 hours of symptoms, and a perforated appendix sharply raises the risk of life-threatening infection 1. Ectopic pregnancy — an embryo implanted in a fallopian tube — can rupture and cause life-threatening internal hemorrhage; the American College of Obstetricians and Gynecologists describes rupture as a medical emergency requiring immediate surgery 2. Ovarian torsion can cut off blood supply to the ovary and requires surgery within hours to preserve function.

None of these can be reliably sorted out by symptoms alone. They need imaging, blood tests, and a clinician. An urgent care or telehealth visit cannot provide this. The emergency room can.

What could be causing pain in this location?

| Possibility | When to consider it | |---|---| | Appendicitis | Pain started near the navel and moved to the lower right; nausea, low-grade fever, pain worse with movement | | Ovarian torsion (in people with ovaries) 3 | Sudden, severe, one-sided pain; nausea and vomiting; known ovarian cysts | | Ruptured ovarian cyst | Sudden severe pain in someone with a known cyst history; may follow physical activity | | Ectopic pregnancy | Could be pregnant; missed period; shoulder pain; feeling faint — this is an immediate emergency 2 | | Kidney stone | Pain comes in waves, radiates to the groin or back, blood in urine | | Hernia or bowel obstruction | Visible bulge at the groin; prior abdominal surgeries; known inflammatory bowel disease |

Imaging — usually a CT scan or ultrasound — is what distinguishes these possibilities. There is no safe way to tell them apart at home.

What NOT to do while getting to the ER

  • Do not eat or drink anything. Surgery may be needed, and an empty stomach is required.
  • Do not take ibuprofen, naproxen, or laxatives before being examined. These can mask symptom changes that help clinicians assess severity.
  • Do not apply heat. A heating pad may increase inflammation.
  • Do not drive yourself if the pain is severe enough to be distracting. Call 911 or have someone drive you.

What will the ER team do?

Tell the triage nurse the pain is severe, where it is exactly, when it started, and how it has changed. Mention nausea, vomiting, fever, last bowel movement, and — if relevant — your last menstrual period.

The 2023 ACEP clinical policy on suspected appendicitis recommends the following standard workup 1:

  • CT scan of the abdomen and pelvis — the most accurate imaging for appendicitis and most other causes of lower-right pain
  • Ultrasound — used first in children and in anyone who could be pregnant, to avoid radiation exposure; also evaluates ovarian cysts and torsion
  • Blood tests — a complete blood count showing elevated white cells can suggest infection or inflammation
  • Urine pregnancy test — ordered routinely before imaging in anyone who could be pregnant, to rule out ectopic pregnancy 2
  • Urinalysis — detects blood in urine (suggesting a kidney stone) or signs of infection

The exact time symptoms started and how they have changed are the most useful pieces of information you can provide.

Common questions

Can lower-right abdominal pain be something minor?

Sometimes — muscle strain, gas, or constipation can cause mild right-sided pain. But severe, worsening, or sudden-onset pain is a different situation. The conditions that cause this kind of pain are not safe to watch and wait. Get evaluated in the ER.

How fast does appendicitis progress to rupture?

Appendicitis can rupture as early as 24 to 72 hours after symptoms begin, though the timeline varies. Rupture significantly increases the risk of serious infection and a more complex recovery. This is why delay is not safe.

Is ectopic pregnancy always painful?

Not always — some people have minimal symptoms early on. Once a fallopian tube ruptures, the pain is usually sudden and severe, often accompanied by dizziness or fainting from internal bleeding. Anyone who could be pregnant and has lower abdominal pain should be seen urgently.

If the pain eases, do I still need to go to the ER?

Yes. A sudden easing of severe pain — especially if it follows a period of intense pain — can indicate rupture, not improvement. Do not interpret pain improvement as a reason to delay care.

Go to the emergency room now

  • —Pain is severe and has been worsening over several hours
  • —Abdomen feels rigid or board-like to the touch
  • —High fever (above 38.5°C / 101.3°F) with the pain
  • —Vomiting that will not stop
  • —You fainted or nearly fainted from the pain
  • —You are pregnant — any severe abdominal pain in pregnancy is an emergency
  • —The pain suddenly became much worse and then seemed to ease (can signal rupture)

Go to the nearest emergency room immediately. Call 911 if you cannot move safely, if you have fainted, or if you are pregnant. Do not drive yourself if the pain is severe.

This article provides general health information only. It is not a diagnosis or a substitute for emergency medical evaluation. Severe abdominal pain requires in-person assessment — please go to an emergency room now.

References

  1. 1.Diercks DB, Adkins EJ, Harrison N, Sokolove PE, Kwok H, Wolf SJ; American College of Emergency Physicians Clinical Policies Subcommittee (2023). Clinical Policy: Critical Issues in the Evaluation and Management of Emergency Department Patients With Suspected Appendicitis. Annals of Emergency Medicine. doi:10.1016/j.annemergmed.2023.01.015 ✓CT and ultrasound imaging for suspected appendicitis; IV contrast recommendations; urine pregnancy test before imaging; perforation risk and timing
  2. 2.American College of Obstetricians and Gynecologists (2024). Ectopic Pregnancy. ACOG Patient Education FAQs. link ✓Ectopic pregnancy as a cause of lower abdominal pain; risk of fallopian tube rupture causing life-threatening internal hemorrhage; emergency surgery required for rupture
  3. 3.Damigos E, Johns J, Ross J (2012). An update on the diagnosis and management of ovarian torsion. Obstetrics & Gynaecology. doi:10.1576/toag.13.4.229.27672 ✓Ovarian torsion as a cause of sudden unilateral lower pelvic pain requiring surgical intervention to preserve ovarian function

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.