18 Common Causes of Pain in the Right Side

Nearly 1 in 5 emergency room visits in the United States involves abdominal or flank pain, and a significant portion of those cases involve discomfort specifically on the right side of the body. Yet many people spend days, weeks, or even months dismissing right-sided pain as “just a pulled muscle” or “something I ate,” only to discover a condition that needed attention far sooner.

Pain in the right side is one of the most diagnostically complex symptoms a person can experience. The right side of your body houses a remarkable cluster of vital organs — the liver, gallbladder, right kidney, appendix, part of the colon, and more — meaning the same general area of discomfort can signal dozens of very different conditions.

Understanding the most common causes is the first step toward getting the right care at the right time. This article will explore 18 Common Causes of Pain in the right side.

⚠️ Important: This article provides general information only. Not intended as medical advice. Consult your doctor before trying any remedies.

The Anatomy of Right-Sided Digestion

Before diving into the causes, it helps to know what’s actually located on your right side. This context makes it much easier to understand why so many different conditions can cause pain in the same general region.

• Liver: This large, vital organ sits predominantly on your upper right side, tucked under your ribs. Its functions are vast, including metabolizing nutrients, detoxifying harmful substances, and producing bile, which is essential for fat digestion. Liver issues can sometimes manifest as a dull ache or pressure.
• Gallbladder: A small, pear-shaped organ located just beneath the liver. Its primary job is to store and concentrate bile produced by the liver. When you eat fatty foods, the gallbladder releases bile into the small intestine. Gallbladder problems, like gallstones, can cause sharp pain that radiates to the right shoulder or back.
• Duodenum: This is the first, shortest, and widest part of the small intestine, immediately following the stomach. It’s where most chemical digestion occurs, and where bile and pancreatic enzymes enter the digestive tract.
• Ascending Colon: This part of the large intestine travels upward on the right side of your abdomen. Its main role is to absorb water and nutrients from the remaining indigestible food matter and compact it into stool. Issues here, such as constipation or inflammation, can lead to discomfort.
• Appendix: A small, finger-shaped pouch projecting from your large intestine on the lower right side. While its exact function isn’t fully understood, it’s notorious for becoming inflamed (appendicitis), which typically causes severe pain that starts around the belly button and shifts to the lower right.
• Right Kidney: While not strictly part of the digestive system, your right kidney is located behind the digestive organs on your right side. Kidney issues, like kidney stones or infections, can sometimes mimic digestive discomfort.

Given the intricate network of organs in this region, it’s clear why right-sided discomfort warrants attention. While acute, severe, or persistent pain always requires immediate medical evaluation, many instances of less severe discomfort often point back to common digestive woes like gas, bloating, constipation, indigestion, or even conditions like Irritable Bowel Syndrome (IBS).

18 Common Causes of Pain in the Right Side

With that map in mind, let’s explore the 18 most common causes of right-side pain — from the mundane to the urgent.

1.  Appendicitis

Appendicitis is the most classic cause of lower-right abdominal pain and one of the most time-sensitive medical emergencies on this list.

The appendix is a small, finger-shaped pouch attached to the large intestine in the lower right abdomen. When it becomes inflamed — usually due to a blockage — the result is escalating pain that typically:

• Starts around the navel
• Migrates to the lower right quadrant (McBurney’s point)
• Worsens with movement, coughing, or deep breathing
• Is accompanied by nausea, vomiting, fever, and loss of appetite

💬 “Appendicitis pain that starts mild and becomes severe within 24 hours is a red flag that demands immediate emergency care.”

What to do: If you suspect appendicitis, go to the emergency room immediately. A ruptured appendix can be life-threatening.

2.  Gallstones and Gallbladder Disease

The gallbladder sits just beneath the liver in the upper right abdomen. Gallstones — hardened deposits of digestive fluid — affect approximately 25 million Americans and are one of the leading causes of upper-right pain in the right side.

Gallbladder pain (biliary colic) typically:

• Occurs in the upper right or center of the abdomen
• Radiates to the right shoulder or back
• Comes on suddenly, especially after fatty meals
• Lasts from 30 minutes to several hours

Cholecystitis (gallbladder inflammation) causes similar but more persistent pain, often with fever and tenderness.

Risk factors include:

• Being female, over 40, overweight, or pregnant (the “4 F’s”: Female, Forty, Fat, Fertile)
• Rapid weight loss
• High-fat diet

3.  Liver Conditions

The liver is the largest internal organ and occupies much of the upper right abdomen. Several liver conditions can cause dull, aching, or pressure-like pain in this region:

• Hepatitis (A, B, or C): Inflammation of the liver, causing right-sided aching, fatigue, and jaundice
• Fatty liver disease (NAFLD/NASH): Increasingly common; often causes a dull ache or fullness in the upper right
• Liver abscess: A pocket of pus causing sharp, localized pain and fever
• Liver cancer: May cause a dull, persistent ache in the upper right

The liver itself has no pain receptors, but its outer capsule (Glisson’s capsule) does, so pain typically signals significant swelling or stretching.

4.  Kidney Stones

Kidney stones are notoriously painful — often described as “the worst pain of my life” by those who’ve experienced them. When a stone forms in the right kidney or travels down the right ureter, it causes:

• Severe, cramping pain in the right flank (side and back)
• Pain that radiates to the lower right abdomen and groin
• Waves of intense pain (renal colic)
• Blood in the urine (hematuria)
• Nausea and vomiting

Kidney stones affect about 1 in 11 people in the U.S. at some point in their lives, according to the National Kidney Foundation.

Treatment ranges from drinking plenty of water and pain management for small stones to lithotripsy or surgery for larger ones.

5.  Kidney Infection (Pyelonephritis)

A kidney infection typically begins as a urinary tract infection (UTI) that travels upward to one or both kidneys. When the right kidney is affected, symptoms include:

• Dull to severe right flank pain
• Fever, chills, and sweating
• Frequent, painful urination
• Nausea and vomiting
• Cloudy or foul-smelling urine

⚠️ Important: Kidney infections require prompt antibiotic treatment. Left untreated, they can lead to serious complications including sepsis.

6.  Irritable Bowel Syndrome (IBS)

IBS is a chronic functional disorder affecting the large intestine. It’s one of the most common causes of recurring pain in the right side (as well as the left), affecting up to 15% of the global population.

IBS pain is typically:

• Crampy and intermittent
• Relieved (at least partially) by bowel movements
• Associated with bloating, gas, diarrhea, or constipation

Because the ascending colon runs up the right side of the abdomen, IBS-related gas and cramping frequently cause right-sided discomfort.

Management includes dietary changes (low-FODMAP diet), stress reduction, and medications.

7.  Gas and Bloating

Sometimes the simplest explanation is the right one. Trapped gas in the hepatic flexure — the bend in the colon just beneath the liver on the right side — can cause surprisingly sharp, stabbing pain that mimics more serious conditions.

This is called hepatic flexure syndrome, and it can be alarming but is generally harmless. It’s often triggered by:

• Eating too quickly
• Carbonated beverages
• High-fiber foods are introduced too rapidly
• Food intolerances (lactose, gluten)

Relief usually comes with movement, passing gas, or over-the-counter simethicone products.

8.  Hernia (Inguinal or Abdominal)

A hernia occurs when an organ or fatty tissue pushes through a weak spot in the surrounding muscle or connective tissue. Inguinal hernias — the most common type — frequently cause right-side groin and lower abdominal pain.

Signs of a hernia include:

• A visible bulge in the groin or abdomen
• Pain or discomfort when bending, coughing, or lifting
• A heavy or dragging sensation

Strangulated hernias (where blood supply to the herniated tissue is cut off) are emergencies requiring immediate surgery.

9.  Ovarian Cysts and Conditions (Women)

For women, the right ovary and fallopian tube sit in the lower right abdomen, making several gynecological conditions a common source of right-side pelvic and abdominal pain:

• Ovarian cysts: Fluid-filled sacs that can cause dull aching or sudden sharp pain if they rupture
• Ovarian torsion: Twisting of the ovary — a surgical emergency causing severe, sudden pain
• Endometriosis: Tissue similar to the uterine lining grows outside the uterus, causing chronic pelvic pain
• Ectopic pregnancy: A fertilized egg implants in the fallopian tube — a life-threatening emergency

💬 “Any sudden, severe right-sided pelvic pain in women of reproductive age should be evaluated immediately to rule out ovarian torsion or ectopic pregnancy.”

10.  Muscle Strain and Injuries

Not every cause of pain in the right side is internal. The muscles, tendons, and ligaments of the right flank, abdomen, and chest wall are frequently strained through:

• Heavy lifting or sudden twisting
• Intense exercise or sports
• Prolonged coughing or sneezing
• Poor posture over time

Muscle strain pain is typically:

• Localized and tender to the touch
• Worsened by specific movements
• Improved with rest and anti-inflammatory medications

This is often the cause of right-side pain after a tough workout — and it’s usually nothing to worry about.

11. Pleurisy and Lung Conditions

The right lung and its surrounding pleural lining (pleura) occupy the upper right chest. Several pulmonary conditions can cause right-sided chest and upper abdominal pain:

• Pleurisy: Inflammation of the pleura, causing sharp pain that worsens with breathing or coughing
• Pneumonia: Infection of the right lung can cause referred pain to the right side and upper abdomen
• Pulmonary embolism (PE): A blood clot in the right lung causes sudden, sharp chest pain — a medical emergency
• Pneumothorax: A collapsed lung causes sudden, severe chest pain

Key clue: If right-sided pain worsens significantly when you breathe in deeply, a lung or pleural cause should be investigated promptly.

12.  Costochondritis and Rib Pain

Costochondritis is inflammation of the cartilage connecting the ribs to the breastbone. It can affect the right side and cause:

• Sharp or aching chest and upper-right abdominal pain
• Pain that worsens with pressure on the chest or deep breathing
• Discomfort that mimics cardiac or gastrointestinal conditions

Rib fractures (from trauma or even severe coughing in people with osteoporosis) also cause localized right-side pain that intensifies with breathing or movement.

13.  Shingles (Herpes Zoster)

Shingles is caused by the reactivation of the varicella-zoster virus (the chickenpox virus) and can affect any nerve pathway in the body. When it affects nerves on the right side of the trunk, it causes:

• Burning, stabbing, or tingling pain — often before any rash appears
• A characteristic blistering rash that follows a band-like pattern on one side
• Extreme skin sensitivity in the affected area

⚠️ Note: Shingles pain can precede the rash by several days, making it easy to mistake for other causes of right-side pain. The rash is the diagnostic giveaway.

The shingles vaccine is recommended for adults 50 and older and significantly reduces risk.

14.  Inflammatory Bowel Disease (IBD)

Crohn’s disease and ulcerative colitis are the two main forms of inflammatory bowel disease. Crohn’s disease most commonly affects the terminal ileum — the last segment of the small intestine, located in the lower right abdomen — making it a frequent cause of right-side pain.

Symptoms include:

• Chronic or recurring right lower abdominal pain
• Diarrhea (sometimes bloody)
• Weight loss and fatigue
• Fever during flare-ups

Crohn’s disease can be difficult to distinguish from appendicitis based on symptoms alone, which is why imaging and blood tests are essential for diagnosis.

15.  Diverticulitis (Right-Sided)

Most people associate diverticulitis with left-sided pain (sigmoid colon), but right-sided diverticulitis does occur — particularly in people of Asian descent, where it’s actually more common than the left-sided variety.

Right-sided diverticulitis involves small pouches (diverticula) in the ascending colon becoming inflamed or infected. Symptoms include:

• Right lower or mid-abdominal pain (easily confused with appendicitis)
• Fever and chills
• Nausea and changes in bowel habits

Treatment typically involves antibiotics and sometimes surgery for recurrent or complicated cases.

16.  Psoas Muscle Abscess or Inflammation

The psoas muscle runs from the lower spine through the pelvis and into the upper thigh. An abscess or inflammation of the right psoas muscle can cause:

• Deep, aching right-side or lower back pain
• Pain that worsens with hip extension
• Fever and general malaise (if infected)

This is a less common but important cause to know about, as it can be associated with Crohn’s disease, spinal infections, or spread from other abdominal infections.

17.  Abdominal Aortic Aneurysm (AAA)

An abdominal aortic aneurysm is an enlargement of the aorta — the body’s main blood vessel — in the abdominal area. While the aorta runs centrally, a leaking or rupturing AAA can cause severe pain that radiates to the right or left side, back, and groin.

This is a life-threatening emergency. Warning signs include:

• Suddenly, severe abdominal or back pain
• A pulsating sensation in the abdomen
• Dizziness and rapid heart rate

AAA is more common in men over 65 who smoke or have high blood pressure. Routine screening ultrasound is recommended for at-risk individuals.

18. Referred Pain from Other Areas

Sometimes, pain in the right side isn’t coming from the right side at all. Referred pain occurs when a problem in one area of the body is felt in another, due to shared nerve pathways.

Common examples relevant to right-side pain include:

💬 “Referred pain is one of the most underappreciated causes of diagnostic confusion in medicine. The body’s nerve map doesn’t always follow intuitive geography.”

When Is Pain in the Right Side a Medical Emergency? 🚨

Knowing when to seek immediate care is critical. Go to the emergency room or call 911 if you experience right-side pain accompanied by:

• ✅ Fever above 101°F (38.3°C)
• ✅ Severe, sudden-onset pain (especially if it’s the “worst pain of your life”)
• ✅ Vomiting blood or blood in the stool
• ✅ Inability to stand up straight or find a comfortable position
• ✅ Shortness of breath or chest tightness
• ✅ Signs of shock (pale, clammy skin; rapid heartbeat; confusion)
• ✅ Pregnancy with sudden right-sided pain

See a doctor within 24–48 hours if:

• Pain has persisted for more than 2–3 days
• Pain is recurring without a clear cause
• You have unexplained weight loss, fatigue, or appetite changes alongside the pain

How Doctors Diagnose Pain in the Right Side

Diagnosing the cause of right-side pain typically involves a combination of:

1. Medical history and physical exam

• Location, onset, character, and duration of pain
• Associated symptoms
• Personal and family medical history

2. Laboratory tests

• Complete blood count (CBC) — checks for infection or anemia
• Liver function tests (LFTs)
• Urinalysis — checks for kidney issues
• Pregnancy test (for women of reproductive age)
• Lipase/amylase — checks for pancreatic involvement

3. Imaging studies

• Ultrasound: First-line for gallbladder and kidney issues
• CT scan: Gold standard for appendicitis, kidney stones, and many abdominal conditions
• MRI: Used for soft tissue detail, liver, and gynecological conditions
• X-ray: For rib fractures or bowel obstruction

Lifestyle Factors That Contribute to Right-Side Pain

Many causes of right-sided pain are influenced by lifestyle choices. Here are some modifiable risk factors worth addressing:

Making targeted lifestyle changes can significantly reduce the risk of several conditions on this list — and improve outcomes for those already diagnosed.

A Quick Reference: 18 Causes at a Glance

Conclusion: Don’t Ignore Pain in the Right Side

Right-side pain is your body’s way of sending a signal — and the message is worth listening to. While some causes are entirely harmless (trapped gas, minor muscle strain), others demand prompt or even emergency medical attention. The challenge is that the right side of the body is anatomically dense, meaning the same area of discomfort can point to a dozen different conditions.

Here are your actionable next steps:

1. Track your symptoms. Note the location, intensity, character (sharp, dull, crampy), timing, and any associated symptoms. This information is invaluable for your doctor.
2. Don’t wait for “unbearable.” Persistent pain lasting more than a few days deserves a medical evaluation — even if it’s not severe.
3. Know your emergency signs. Sudden severe pain, fever, vomiting blood, or signs of shock require immediate emergency care.
4. Address lifestyle risk factors. Diet, hydration, exercise, and stress management can reduce the risk of many conditions on this list.
5. Follow up on diagnoses. Conditions like IBS, Crohn’s disease, and fatty liver require ongoing management — not just a one-time visit.

Nowadays, with access to advanced imaging, blood tests, and specialist care, most causes of right-sided pain are diagnosable and treatable. The key is not to dismiss what your body is telling you.