Appendicitis

Symptoms

• Migrating Right Lower Abdominal Pain: Pain that often begins near the navel and then moves to the lower right side of the abdomen, becoming sharper and steadily worse over hours.
• Pain Worsened by Movement: Discomfort that intensifies with coughing, walking, or any jarring movement of the abdomen.
• Loss of Appetite: A sudden and noticeable drop in appetite that commonly appears alongside the pain.
• Nausea and Vomiting: Feeling sick or vomiting, which usually starts after the abdominal pain rather than before it.
• Low-Grade Fever: A mild fever that may rise as the inflammation progresses.
• Abdominal Tenderness or Bloating: A tender, guarded belly, sometimes with swelling or a change in bowel habits such as constipation or diarrhea.

When it's an emergency

Come straight to Bellaire ER — open 24/7 — if you have pain in the lower right abdomen that is worsening, especially if it started near your navel and moved, or if it comes with fever, nausea, vomiting, or loss of appetite. Appendicitis is a surgical emergency, and the appendix can rupture within about 48 to 72 hours of symptoms starting, so waiting is risky.

Call 911 or seek emergency care immediately if you develop sudden, severe, widespread belly pain, a high fever with chills, a rigid or very tender abdomen, or you feel faint. These can signal a ruptured appendix and peritonitis, a serious infection of the abdominal lining.

Children, pregnant patients, and older adults can have less typical symptoms, so any persistent or worsening abdominal pain in these groups warrants prompt in-person evaluation. When in doubt, it is safer to be seen than to wait at home. Bellaire ER confirms or rules out appendicitis with on-site CT and ultrasound, starts treatment immediately, and arranges prompt transfer for surgery when it is needed.

When it's not an emergency

Not every stomachache is appendicitis. Brief, mild abdominal discomfort that comes and goes, improves after a bowel movement or passing gas, or clearly follows a stomach bug or a known trigger is often not an emergency and can reasonably be managed with your primary care doctor or a telemedicine visit.

Watchful waiting at home is reasonable when your pain is mild, stable, and not localizing to the lower right abdomen, and you have no fever, repeated vomiting, or worsening symptoms. A clinician can help sort out common causes like gas, indigestion, or a viral illness.

That said, appendicitis pain classically gets worse, not better. If mild pain shifts to the lower right side, intensifies, or is joined by fever, nausea, or vomiting, stop waiting and come to the ER for imaging.

What else could be causing this

Appendicitis itself

The appendix becomes blocked, usually by hardened stool, swollen lymphoid tissue after a viral illness, or less often a growth, and then becomes inflamed and infected behind the blockage. The sequence is characteristic: appetite goes first, then vague pain around the navel, then the pain localizes to the lower right and worsens over hours, with nausea following rather than preceding the pain.

Mesenteric adenitis

Inflamed lymph nodes inside the abdomen, usually after a viral infection, and the closest mimic of appendicitis in children and young adults. The pain is in the same place and the blood work can look similar; the differences are a recent sore throat or cold, pain that is less sharply localized, and a child who still wants to move around. Imaging is often what separates the two.

Viral gastroenteritis

A stomach bug produces nausea, vomiting, cramping and diarrhea, and early appendicitis is mistaken for it regularly. What distinguishes appendicitis is the pain taking over as the main symptom, settling into one spot, worsening steadily rather than easing between episodes, and hurting more on movement or coughing.

Ovarian cyst, ovarian torsion and ectopic pregnancy

A ruptured or bleeding ovarian cyst, or an ovary that has twisted on its blood supply, produces sudden severe one-sided lower pain with nausea in exactly the territory of the appendix. In anyone of childbearing age an ectopic pregnancy is the diagnosis that cannot be missed, because a rupture bleeds internally. A pregnancy test comes before anything is assumed.

Pelvic inflammatory disease

Infection of the upper female reproductive tract. The pain is usually lower, often on both sides rather than one, and may come with abnormal discharge, fever, or pain with intercourse. It can be hard to separate from appendicitis on examination alone, which is one of the reasons imaging is used rather than relying on the exam.

Kidney stone and urinary tract infection

A stone passing down the right ureter causes severe waves of flank pain radiating toward the groin, with blood in the urine, and people with it cannot keep still. A kidney infection causes flank pain with fever. Both sit near the appendix, and a urine test does much of the separating.

Crohn's disease affecting the terminal ileum

Inflammation of the last part of the small intestine, which lies immediately next to the appendix and produces pain in the same place. The clue is history: weeks or months of intermittent pain, diarrhea, weight loss or mouth ulcers rather than a single illness over a day. A first presentation can genuinely look like appendicitis.

Diverticulitis

Inflamed outpouchings of the colon, usually on the left but occasionally on the right, particularly in younger patients and in people of East Asian descent. Steady pain in one lower quadrant with fever and a change in bowel habit. Right-sided diverticulitis is treated as appendicitis until imaging says otherwise.

Testicular torsion

A twisted testicle refers pain upward into the lower abdomen and groin, and an adolescent may describe abdominal pain rather than testicular pain. It is time-critical, with a narrow window to preserve the testicle, which is why sudden lower abdominal pain in a boy or young man includes a direct examination.

What happens when you arrive

At Bellaire ER, a board-certified emergency physician examines your abdomen and checks for the classic signs of appendicitis, such as tenderness and pain over the lower right side. Because timing matters, the evaluation is built to answer the question in one place rather than sending you elsewhere for imaging.

We confirm the diagnosis using on-site testing in a single visit. That typically includes blood work to look for signs of infection and imaging with our on-site CT scanner or ultrasound to look directly at the appendix, so we are not guessing.

Appendicitis is treated with surgery (an appendectomy) or, in select cases, antibiotics, and surgery is not performed at a freestanding ER. If your imaging confirms appendicitis, we start treatment such as IV fluids, pain control, and antibiotics, and coordinate a prompt transfer to a hospital with surgical services. If we rule appendicitis out, we identify the real cause of your pain and give you a clear follow-up plan before you leave.

Tests we can run on site

CT scan

Cross-sectional imaging of the abdomen and pelvis, and the most reliable test for appendicitis in adults. It shows the inflamed appendix directly, whether it has perforated, whether an abscess has formed, and — just as usefully — which of the alternatives above is the real answer when it is not appendicitis.

Ultrasound

Sound-wave imaging with no radiation. It is the first imaging used in children and in pregnancy, and it can show a thickened, non-compressible appendix. It also examines the ovaries, which is why it is used early in anyone of childbearing age. A normal ultrasound does not exclude appendicitis, because the appendix is not always visible.

Complete blood count

A raised white cell count, particularly with a shift toward immature neutrophils, supports an acute inflammatory process. A normal count does not rule appendicitis out, especially early on, so it is read alongside the examination and the imaging rather than as a verdict on its own.

Comprehensive metabolic panel

Electrolytes, kidney function and hydration status, plus liver and bile-duct values. It establishes how much fluid has been lost to vomiting and poor intake, and it screens for the upper-abdominal causes that present atypically.

Urinalysis

Separates a urinary tract infection or a kidney stone from appendicitis. It also has a confusing side: an inflamed appendix lying against the ureter can put a few white cells and red cells into the urine, so a mildly abnormal result does not settle the question either way.

Pregnancy test

Run for every patient of childbearing age before imaging. It is there to exclude an ectopic pregnancy as the cause and to determine which imaging is appropriate, since ultrasound is used in place of CT in pregnancy.

C-reactive protein

A marker of inflammation in the blood. Rising together with the white cell count it strengthens the case for appendicitis; both being normal in someone who has been unwell for more than a day makes it less likely. It supports a decision rather than making one.

Treated here, or transferred

Bellaire ER is a licensed freestanding emergency room. It has board-certified emergency physicians and nurse practitioners, on-site CT, X-ray, ultrasound and a full laboratory, medication administered during your visit, and it is open 24 hours a day, 365 days a year, for adults and children. It is equipped to evaluate, stabilize and treat — and it is not a hospital. For appendicitis specifically, that means the diagnosis happens here and the operation does not.

The work of this visit is to establish whether this is appendicitis, and to get you ready if it is. On-site CT or ultrasound looks directly at the appendix, laboratory testing supports the picture, and the examination determines how urgent the sequence needs to be. While that is happening, intravenous fluids correct dehydration from vomiting and poor intake, intravenous medication treats pain and nausea, and antibiotics are started when the diagnosis is confirmed — early antibiotics are part of the standard treatment of appendicitis, not just preparation for surgery. Everything the receiving surgeon will want is assembled here: the imaging, the blood work, the timeline.

Definitive treatment is an appendectomy — surgical removal of the appendix — and in selected cases of uncomplicated appendicitis, a course of antibiotics alone, managed by a surgeon. Neither an operating room nor an inpatient bed exists in a freestanding emergency room. So when imaging confirms appendicitis, you are stabilized here and transferred to a hospital with surgical services, with treatment already underway and continuing through the transfer. The same applies to a perforated appendix, an abscess needing image-guided drainage, or peritonitis, all of which need inpatient care. Transfer is the expected path for this condition, and an accurate early diagnosis is what makes it timely — that is the point of coming in rather than waiting at home.

If the evaluation excludes appendicitis, the visit has still done its job: the alternative cause is usually identified in the same workup, treated where it can be, and sent out with a follow-up plan and clear instructions on what would bring you back.

Children

Bellaire ER treats adults and children. Appendicitis is one of the commonest reasons a child needs emergency surgery, and it is harder to recognize in a child than in an adult — the younger the child, the more atypical the presentation and the sooner the appendix perforates. In a child under five, perforation rates are substantially higher precisely because the diagnosis is delayed, so the threshold for being seen is deliberately low.

A young child may not localize the pain or may not describe pain at all, presenting instead with vomiting, refusing food, lethargy, or simply not being themselves. The useful signs are behavioral: a child lying still rather than squirming, refusing to jump or walk, walking bent over, crying when the car goes over a bump, or holding the right side when asked to climb onto the bed. Diarrhea and a low fever do not argue against appendicitis in a child — they are common in it, which is why it gets called a stomach bug. Mesenteric adenitis after a viral illness is the closest mimic and the reason imaging rather than examination alone often settles the question.

Imaging in children starts with ultrasound, which carries no radiation and can show the appendix directly; CT is used when ultrasound cannot answer the question, so the radiation dose is limited to what is necessary. Laboratory testing is done on site. Antibiotics, fluids and pain control start here, and a child with confirmed appendicitis is transferred to a hospital with pediatric surgical services.

Bring a child in urgently for abdominal pain that is worsening over hours, pain that has settled in the lower right, green or bile-stained vomit, a swollen or rigid abdomen, pain with a limp or a refusal to walk, or a child who is unusually quiet and still. Any infant under three months with a rectal temperature of 100.4 degrees Fahrenheit or higher needs emergency evaluation regardless of the rest of the picture.

After you leave

If appendicitis was excluded, the result describes the moment it was taken. Appendicitis evolves, and an appendix that looked normal on imaging six hours into the illness can be obvious by the next morning. Being evaluated and cleared is a reason to come back sooner if the pain changes, not a reason to wait it out — and the comparison with your first visit is genuinely useful information for whoever sees you next.

Come back, or call 911 if you cannot travel safely, if the pain becomes worse, more constant, or more sharply localized to the lower right; if you develop a fever or shaking chills; if vomiting stops you keeping fluids down; or if the abdomen becomes swollen, rigid or tender all over. A particular pattern deserves naming: pain that suddenly eases dramatically and then returns as widespread pain with fever can mean a perforation, and it is not a sign of recovery. Fainting, a racing heart, or confusion should prompt an immediate return.

If you were transferred for surgery, your aftercare comes from the surgical team rather than this page, and their instructions take precedence. Broadly, expect to need a week or two before you feel yourself after a laparoscopic appendectomy and longer after an open or complicated one, finish the antibiotics if any were prescribed, and go back to whoever operated for a fever, increasing abdominal pain, redness or discharge from the incisions, or a wound that opens.

In either case, finish any antibiotic course completely even once you feel well, keep the follow-up appointment you were given, and bring your discharge paperwork and imaging results with you so the tests do not need repeating.

Lowering your risk

There is no proven way to prevent appendicitis, and it can happen to otherwise healthy people of any age. A diet rich in fiber from fruits, vegetables, and whole grains supports overall digestive health, but no diet or supplement reliably prevents the condition. The most important protection is recognizing the symptoms early and seeking care promptly, which greatly lowers the chance of a rupture and its complications.