Lower Right Abdominal Pain in Women: Causes and When It's an Emergency

Pain low on the right side of a woman's belly has a long list of possible causes — most of them harmless, a few of them true emergencies. The everyday culprits are ovulation pain (mittelschmerz), an ovarian cyst, gas or constipation, and a urinary tract infection. But the lower right abdomen is also where appendicitis and an ectopic pregnancy cause pain, and both can be life-threatening. This guide explains how each cause typically feels and the exact red flags that mean you should stop reading and get emergency care. It is general education, not a diagnosis — only an in-person exam and tests can tell you what is actually going on.

When is lower right abdominal pain an emergency?

Some patterns of pain need to be checked today, in an emergency department — not with a scheduled appointment next week. Do not try to wait these out, and do not assume a young, otherwise healthy person is fine.

Go to the ER or call your local emergency number now if you have lower right abdominal pain with any of these:

• Severe pain, or pain that is rapidly getting worse over minutes to a few hours.
• A positive pregnancy test, a possible pregnancy, or a missed period together with one-sided pelvic pain — this can be an ectopic pregnancy until proven otherwise, even if the pain seems mild.
• Fainting, near-fainting, dizziness, a racing heart, or clammy pale skin — signs of internal bleeding or serious infection.
• A high fever or shaking chills.
• A hard, rigid, or board-like belly, or pain so intense you cannot get comfortable in any position.
• Repeated vomiting, or you cannot keep fluids down.
• Pain that started near your navel and has shifted to the lower right over several hours, especially with nausea and loss of appetite — a classic appendicitis pattern.
• Heavy vaginal bleeding, or bleeding with clots and severe pain during pregnancy.

When in doubt, be seen. Appendicitis and ectopic pregnancy are two conditions where waiting a few extra hours genuinely changes outcomes, and neither can be safely ruled out from home.

What's in the lower right side of a woman's abdomen?

Knowing what sits in that quadrant helps explain why the pain can come from so many different systems. Overlapping in the lower right are:

• The appendix — a small pouch off the large intestine, low on the right.
• The right ovary and fallopian tube — reproductive organs that swell, cyst, twist, or become a site of ectopic pregnancy.
• The lower bowel — where gas, constipation, and irritable bowel symptoms cause cramping.
• The right ureter and bladder — the plumbing that carries urine, prone to infection and stones.
• The abdominal and groin wall — where a hernia can bulge.

Because reproductive, digestive, and urinary organs share this space, the same spot can hurt for reasons that need very different care. That is also why one-sided pelvic pain deserves a real evaluation rather than guesswork. Our overview of pelvic pain and the deeper dive into pelvic pain causes walk through the full map.

Common causes of lower right abdominal pain in women

Use the decoder below to compare how each cause typically feels. Symptoms overlap heavily, so treat this as a starting point for a conversation with a clinician — not a way to self-diagnose.

Ovulation pain (mittelschmerz)

Around the time an ovary releases an egg, some women feel a one-sided twinge or ache. If it falls on the right, it lands exactly where the pain in question usually sits. It is typically brief and mild, and it recurs near the same point in your cycle. If your pain reliably shows up mid-cycle and fades within a day, ovulation is a likely explanation — but it should never come with fever, vomiting, or fainting. To sanity-check the timing, see how long ovulation lasts.

Ovarian cyst

Fluid-filled sacs on the ovary are extremely common and most cause no symptoms at all. A larger cyst can create a dull, one-sided pressure or ache. The situations that turn urgent are a ruptured cyst or ovarian torsion (a twisted ovary), which can cause sudden, severe pain, often with nausea or vomiting — a reason to be seen right away. Learn more in our guide to ovarian cysts, and if you also have irregular cycles or acne, the difference between ovarian cysts and PCOS.

Appendicitis — do not downplay this one

Appendicitis is the reason clinicians take new-onset lower right pain seriously in anyone. The classic story is pain that begins vaguely around the belly button, then migrates to the lower right and intensifies over hours, joined by nausea, loss of appetite, and a low fever. Movement, coughing, or a bumpy car ride makes it worse. Not everyone follows the textbook, though — which is exactly why steadily worsening lower right pain with these features is an emergency. An inflamed appendix can burst, and prompt care matters.

Ectopic pregnancy — a can't-miss emergency

An ectopic pregnancy is one that implants outside the uterus, most often in a fallopian tube. As it grows it can cause one-sided pelvic pain and abnormal bleeding, and if the tube ruptures it causes dangerous internal bleeding — sometimes signaled by shoulder-tip pain, dizziness, or fainting. The critical point: if you could be pregnant, one-sided lower belly pain must be evaluated urgently, no matter how mild it feels. A pregnancy test and an ultrasound are how this is sorted out safely.

UTI and kidney stones

A bladder infection brings burning with urination, urgency, and low pelvic pressure, and it needs a prompt appointment because it can climb to the kidneys — signaled by fever, chills, and back or flank pain, which is emergency territory. A kidney stone tends to cause severe, cramping waves of pain from the back toward the groin, often with blood in the urine. Both deserve medical care rather than waiting them out.

Constipation, gas, and IBS

Digestive discomfort is one of the most common sources of lower-belly pain. It is usually crampy and bloated, eases after a bowel movement or passing gas, and tracks with your eating and bowel patterns. Gentle self-care — more fluids, fiber, and regular movement — often helps, and some women find magnesium useful for occasional constipation. What digestive pain should not do is cause fever, a rigid belly, or relentless vomiting.

Gynecologic conditions that cause recurring pain

When lower right pain keeps returning and tracks with your cycle, conditions like endometriosis and uterine fibroids are worth investigating. Pelvic inflammatory disease, an infection of the reproductive organs, is another cause that needs timely treatment. None of these are self-diagnosed — but noting when the pain strikes gives your clinician a head start. Explore more in our gynecologic health hub.

When to see a doctor soon vs. when self-care is reasonable

Between "call emergency services" and "watch and wait," most situations fall into two practical buckets.

See a doctor within a day or two if:

• The pain is new, one-sided, and lasts more than a couple of days.
• You have urinary burning, frequency, or cloudy or bloody urine.
• You have unusual vaginal discharge, bleeding between periods, or pain during sex.
• Pain keeps returning with your menstrual cycle, or is getting worse month over month.
• You have a groin bulge, or a change in bowel habits that lasts more than a week or two.
• You are pregnant, or could be, and have any belly pain — even without other red flags.

Reasonable to self-care and monitor if:

• The pain is mild, familiar, and clearly tied to ovulation or your period.
• It eases after passing stool or gas and comes with obvious bloating.
• You have no fever, no vomiting, no fainting, and no pregnancy possibility.
• It settles within a day or two with rest, fluids, and a heating pad.

Even in the self-care bucket, trust a change in pattern. Pain that suddenly behaves differently than your normal deserves a call. If you are unsure which bucket you're in, our symptom self-checks can help you organize what to tell a clinician — they don't diagnose, but they make the visit more useful.

What will a doctor do to find the cause?

An evaluation for lower right pain usually starts with your story — where it hurts, how it began, and what makes it better or worse — followed by an exam that presses on the abdomen to check for tenderness and guarding. From there, common next steps include:

1. A urine pregnancy test for anyone who could be pregnant — this is routine, not an assumption about you.
2. A urine test to look for infection or blood.
3. Blood tests to check for signs of infection or inflammation.
4. Imaging — a pelvic ultrasound to look at the ovaries and uterus, or a CT scan when appendicitis or a stone is suspected.

Because so many organs share this quadrant, testing is how clinicians separate an ovarian cyst from appendicitis from an ectopic pregnancy. That is precisely why serious causes cannot be ruled out from home.

The bottom line

Most lower right abdominal pain in women turns out to be something manageable — ovulation, a cyst, digestion, or a UTI. But the same corner of the body hosts two emergencies, appendicitis and ectopic pregnancy, that should never be brushed off. Track when the pain comes, note any red flags, and get urgent care for severe or worsening pain, fever, vomiting, fainting, a rigid belly, or any belly pain when pregnancy is possible. When you're not sure, being seen is always the safer choice.

This article is for general education and does not replace medical advice, diagnosis, or treatment. It does not tell you to start, stop, or change any medication. If you think you have an emergency, call your local emergency number or go to the nearest emergency department.