Appendicitis in Adults: How to Tell If That Stomach Pain Is Serious

Stomach pain is one of those things most adults have learned to live with. A bad meal, a stressful week, a digestive system that’s just having an off day, there are plenty of explanations that don’t require a trip to the doctor. So when a dull ache shows up somewhere in the abdomen, the natural instinct is to wait and see.

Most of the time, that instinct is fine. But occasionally, that pain is the beginning of something that genuinely needs urgent attention. Appendicitis is one of those situations and the tricky part is that it doesn’t always announce itself obviously, especially in adults.

What Is the Appendix, and What Happens When It Gets Inflamed?

The appendix is a small, finger shaped pouch attached to the large intestine, sitting in the lower right side of the abdomen. Its exact function in adults isn’t entirely clear, what is clear is that when it becomes inflamed, it becomes a problem that needs to be dealt with promptly.

Appendicitis occurs when the appendix gets blocked by hardened stool, mucus, or in some cases an infection and bacteria begin to multiply inside it. The appendix swells, pressure builds, and if left untreated, it can rupture. A ruptured appendix spills infected material into the abdominal cavity, leading to a serious condition called peritonitis. That’s the situation everyone is trying to avoid.

The Classic Symptoms And Why Adults Sometimes Miss Them

There’s a textbook description of appendicitis that most people have heard: pain starting around the belly button, then shifting to the lower right side of the abdomen. That shift is fairly characteristic and happens because the appendix is located in the lower right quadrant.

But here’s what makes it complicated in adults, the presentation isn’t always that clean.

Pain that starts around the navel and moves to the lower right abdomen over several hours is the classic pattern. But some adults experience the pain differently from the start. Others have a higher pain threshold and don’t register the severity until things have progressed further. And in certain cases particularly in older adults, the symptoms are more muted and easier to dismiss.

Beyond the pain, other symptoms to watch for include:

• Loss of appetite – this often shows up early, sometimes even before the pain becomes significant
• Nausea and vomiting – usually following the onset of pain rather than preceding it
• Low-grade fever – typically between 37.5°C and 38.5°C in the early stages; higher if the appendix has ruptured or infection has spread
  
  Bloating or a feeling of abdominal fullness
• An inability to pass gas – less commonly discussed but worth noting
• Diarrhoea or constipation – some patients experience changes in bowel habit alongside the pain

The combination of symptoms matters more than any single one. Pain alone could be many things. Pain plus nausea plus fever plus loss of appetite – that combination deserves attention.

The Pain Itself What Makes It Different

Not all abdominal pain is the same, and the character of appendicitis pain has a few distinguishing features worth knowing.

It tends to be constant rather than coming and going in waves. Conditions like gas or muscle cramps often produce pain that eases and returns. Appendicitis pain, once it sets in properly, generally doesn’t give much relief it stays, and it often worsens with movement.

Many patients find that moving around, coughing, or taking deep breaths makes the pain sharper. Some describe finding relief only when lying still, often curled slightly to one side. That pattern pain that’s aggravated by movement and eases with stillness, is a useful signal.

Pressing on the lower right abdomen and then quickly releasing the pressure can produce a sharp, pronounced pain. This is called rebound tenderness, and it’s one of the things doctors check for during a physical examination when appendicitis is suspected.

When It Becomes an Emergency

If the appendix ruptures, the situation changes quickly. Symptoms that suggest this has happened include:

• Sudden, severe pain that briefly eases and then returns worse than before, this temporary relief after a rupture can be misleading
• High fever, usually above 38.5°C
• Abdomen that feels rigid or board-like to touch
• Significantly worsening overall condition, rapid heartbeat, looking unwell, extreme fatigue

A ruptured appendix is a surgical emergency. The window between the start of appendicitis and rupture varies, but it can happen within 24 to 72 hours of symptom onset in some cases. Waiting to see if things improve is not advisable once symptoms are escalating.

How Is Appendicitis Diagnosed?

There’s no single test that definitively confirms appendicitis on its own. Diagnosis is usually a combination of:

• Physical examination – pressing on specific areas of the abdomen to check for tenderness and rigidity
• Blood tests – an elevated white blood cell count points to infection or inflammation
• Urine test – to rule out a urinary tract infection or kidney stone, which can mimic appendicitis
• Ultrasound or CT scan – imaging helps visualise the appendix and confirm inflammation, though ultrasound in particular has limitations in adults

Doctors put all of this together rather than relying on any single finding.

Treatment Is Surgery Always Necessary?

For most cases of appendicitis, yes surgical removal of the appendix, called an appendectomy, is the standard treatment. In uncomplicated cases, this is now routinely done laparoscopically, through small keyhole incisions. Recovery is typically faster, with most patients back to normal activity within one to two weeks.

There has been some research into treating mild, uncomplicated appendicitis with antibiotics alone, without surgery. In selected cases this can work, but recurrence rates are a consideration, and it’s not universally applicable. For most patients presenting with appendicitis, surgery remains the clearest and most definitive solution.

A ruptured appendix requires more involved treatment, draining any abscess, managing infection, and surgery, sometimes in stages depending on the severity.

What Conditions Can Mimic Appendicitis?

This is worth knowing, because a number of conditions produce similar symptoms:

• Ovarian cysts or torsion – in women, right-sided lower abdominal pain can sometimes originate from the ovary rather than the appendix
• Kidney stones – particularly on the right side, can cause significant lower abdominal and flank pain
• Urinary tract infections – especially in women, can produce lower abdominal discomfort and fever
• Irritable bowel syndrome or severe constipation – can cause cramping in the lower right area
• Mesenteric lymphadenitis – swollen lymph nodes in the abdomen, often following a viral infection, can closely mimic appendicitis

This overlap is exactly why proper clinical assessment and investigation matters – self-diagnosing abdominal pain, in either direction, carries real risk.

Final Thoughts

Stomach pain is common and usually nothing serious. But certain combinations of symptoms, particularly lower right abdominal pain, fever, nausea, and loss of appetite that don’t resolve within a few hours warrant a proper medical evaluation rather than waiting it out at home.

Appendicitis moves faster than most people expect. Getting it assessed early usually means a straightforward laparoscopic procedure and a quick recovery. Waiting until it’s clearly an emergency means a significantly more complicated situation.

Our surgical team is experienced in evaluating and managing appendicitis, from initial assessment through to laparoscopic appendectomy where needed. If you or someone in your family is dealing with abdominal pain that doesn’t feel right, come in and get it checked. It’s always better to rule it out than to find out too late.