Abdominal Pain: Clinical Meaning

Gastritis

Gastritis is inflammation of the stomach lining, commonly caused by H. pylori infection, prolonged NSAID use, or excessive alcohol. It can be acute (sudden) or chronic (long-term) and may lead to peptic ulcers if untreated.

Peptic Ulcer

Peptic ulcers are open sores that develop on the inner lining of the stomach or the upper part of the small intestine. H. pylori infection and long-term NSAID use are the most common causes. They cause burning stomach pain, especially when the stomach is empty.

Colitis (Ulcerative Colitis)

Ulcerative colitis is a chronic inflammatory bowel disease causing long-lasting inflammation and ulcers in the digestive tract, primarily affecting the colon and rectum. It leads to abdominal pain, diarrhea with blood, and urgency.

Hepatitis

Hepatitis is inflammation of the liver, most commonly caused by viral infections (Hepatitis A, B, C, D, E). It can also result from alcohol use, toxins, or autoimmune conditions. Symptoms include jaundice, fatigue, abdominal pain, and dark urine.

Liver Cirrhosis

Liver cirrhosis is advanced scarring (fibrosis) of the liver caused by long-term damage from hepatitis, alcohol abuse, or fatty liver disease. As scar tissue replaces healthy tissue, the liver loses its ability to function properly.

Pancreatitis

Pancreatitis is inflammation of the pancreas, which can be acute (sudden) or chronic (long-term). Gallstones and heavy alcohol use are the most common causes. It causes severe upper abdominal pain that may radiate to the back, nausea, and vomiting.

Cholecystitis

Cholecystitis is inflammation of the gallbladder, usually caused by gallstones blocking the bile duct. It causes severe pain in the upper right abdomen, nausea, vomiting, and fever. Acute cholecystitis often requires surgery.

Gallstones

Gallstones are hardened deposits of digestive fluid that form in the gallbladder. They can range from sand-grain size to golf-ball size. Many are asymptomatic, but when they block a duct they cause severe 'biliary colic' pain in the upper right abdomen.

Kidney Stones

Kidney stones are hard mineral deposits that form in the kidneys and can cause severe pain when passing through the urinary tract. The pain typically starts in the back or side and radiates to the lower abdomen. Increased fluid intake is key to prevention.

Cystitis (Urinary Tract Infection)

Cystitis is inflammation of the bladder, usually caused by a bacterial urinary tract infection (UTI). It causes a burning sensation during urination, frequent urge to urinate, cloudy urine, and pelvic discomfort. Women are significantly more affected than men.

Prostatitis

Prostatitis is inflammation of the prostate gland, which can be caused by bacterial infection or other factors. It causes pelvic pain, difficult or painful urination, and sometimes fever and chills. Chronic prostatitis is the most common form.

Endometriosis

Endometriosis is a condition where tissue similar to the uterine lining grows outside the uterus. It causes chronic pelvic pain, especially during menstruation, and can lead to infertility. It affects approximately 10% of reproductive-age women.

PCOS (Polycystic Ovary Syndrome)

Polycystic ovary syndrome (PCOS) is a hormonal disorder common among women of reproductive age, causing irregular periods, excess androgen levels, and polycystic ovaries. It is associated with insulin resistance and increased risk of diabetes and heart disease.

Colorectal Cancer

Colorectal cancer develops in the colon or rectum and is the third most common cancer globally. Risk factors include age over 50, family history, inflammatory bowel disease, and diet high in red/processed meat.

Liver Cancer (Hepatocellular Carcinoma)

Hepatocellular carcinoma typically develops in the setting of chronic liver disease or cirrhosis due to hepatitis B, hepatitis C, or alcohol. It is a leading cause of cancer death globally.

Pancreatic Cancer

Pancreatic cancer has one of the lowest survival rates of all cancers, largely due to late-stage diagnosis. Symptoms include jaundice, weight loss, abdominal pain, and new-onset diabetes; most cases are adenocarcinomas.

Stomach Cancer (Gastric Cancer)

Gastric cancer is more common in East Asia and is strongly associated with H. pylori infection, smoking, and salt-preserved foods. It often presents late with weight loss, early satiety, and abdominal pain.

Bile Duct Cancer (Cholangiocarcinoma)

Cholangiocarcinoma arises from the bile duct epithelium and often presents with obstructive jaundice, weight loss, and abdominal pain. It is typically diagnosed at an advanced stage with limited treatment options.

Aortic Aneurysm

An aortic aneurysm is a bulge in the aorta wall that can rupture and cause life-threatening hemorrhage. Abdominal aortic aneurysms are most common and often asymptomatic until rupture; smoking and hypertension are major risk factors.

Typhoid Fever

Typhoid fever is caused by Salmonella typhi, transmitted through contaminated food and water, causing sustained fever, abdominal pain, and rose spots. Antibiotic treatment is effective; vaccination is recommended for travellers to endemic areas.

Hepatitis C

Hepatitis C is a blood-borne viral infection causing chronic liver inflammation that can progress to cirrhosis and liver cancer over decades. Direct-acting antiviral therapy achieves cure rates above 95%.

Appendicitis

Appendicitis is inflammation of the appendix causing progressive right lower quadrant abdominal pain, nausea, fever, and rebound tenderness. Perforation risk increases with delayed treatment; surgical removal (appendectomy) is standard care.

Norovirus (Stomach Flu)

Norovirus is the leading cause of acute gastroenteritis worldwide, spreading through contaminated food, water, and surfaces. It causes sudden-onset vomiting, diarrhea, and stomach cramps lasting 1-3 days; hydration is the mainstay of treatment.

Salmonellosis

Salmonellosis is a foodborne illness caused by Salmonella bacteria, typically from contaminated poultry, eggs, or raw produce. Symptoms include diarrhea, fever, and abdominal cramps beginning 6-48 hours after exposure; most resolve within a week.

Crohn's Disease

Crohn's disease is a chronic inflammatory bowel disease that can affect any part of the GI tract from mouth to anus, causing abdominal pain, diarrhea, and malnutrition. Skip lesions and transmural inflammation are pathological hallmarks.

Celiac Disease

Celiac disease is an autoimmune reaction to gluten that damages the small intestine villi, impairing nutrient absorption. Symptoms include diarrhea, bloating, weight loss, and fatigue; strict gluten-free diet is the only treatment.

Irritable Bowel Syndrome (IBS)

IBS is a functional gastrointestinal disorder causing recurrent abdominal pain related to defecation, with altered stool frequency or consistency. It affects up to 15% of the population; dietary changes, stress management, and symptom-specific medications help.

Diverticulitis

Diverticulitis occurs when diverticula (small pouches in the colon wall) become inflamed or infected, causing left lower quadrant pain, fever, and bowel changes. Uncomplicated cases are treated with antibiotics; perforation or abscess may require surgery.

Inguinal Hernia

An inguinal hernia occurs when tissue (usually part of the intestine) protrudes through a weak spot in the abdominal muscles, causing a groin bulge and discomfort. Surgical repair is recommended for symptomatic hernias.

Intestinal Obstruction

Intestinal obstruction is blockage of the small or large bowel, causing abdominal pain, distension, vomiting, and inability to pass gas or stool. Adhesions and hernias are the most common causes; emergency surgery may be required.

Colon Polyps

Colon polyps are growths on the inner lining of the colon that are usually asymptomatic but can develop into colorectal cancer over time. Colonoscopy is the gold standard for detection and polypectomy; surveillance intervals depend on polyp type and size.

Non-Alcoholic Fatty Liver Disease (NAFLD)

NAFLD is the accumulation of fat in liver cells not caused by alcohol, affecting up to 25% of adults globally. It ranges from simple steatosis to NASH (non-alcoholic steatohepatitis), which can progress to cirrhosis; lifestyle modification is the primary treatment.

SIBO (Small Intestinal Bacterial Overgrowth)

SIBO occurs when excessive bacteria colonize the small intestine, causing bloating, abdominal pain, diarrhea, and malabsorption. It is diagnosed with breath testing and treated with antibiotics and dietary modification.

Gastroparesis

Gastroparesis is delayed gastric emptying without mechanical obstruction, causing early satiety, nausea, vomiting, and abdominal discomfort. Diabetes is the most common cause; prokinetic medications and dietary modifications are the mainstay of treatment.

Dumping Syndrome

Dumping syndrome occurs after gastric surgery when food moves too quickly from the stomach into the small intestine, causing nausea, diarrhea, sweating, and dizziness after meals. Dietary modifications and slower eating are primary management strategies.

Microscopic Colitis

Microscopic colitis causes chronic watery diarrhea with normal colonoscopy appearance but characteristic changes on biopsy (collagenous or lymphocytic colitis). NSAIDs, PPIs, and smoking are risk factors; budesonide is effective treatment.

Mesenteric Ischemia

Mesenteric ischemia is inadequate blood supply to the small intestine, causing severe abdominal pain out of proportion to physical findings. Acute mesenteric ischemia is a surgical emergency; chronic forms cause postprandial pain and weight loss.

Type 1 Diabetes

Type 1 diabetes is an autoimmune disease in which the immune system destroys insulin-producing beta cells in the pancreas, requiring lifelong insulin therapy. It typically develops in childhood or adolescence and accounts for 5-10% of all diabetes cases.

Addison's Disease

Addison's disease is primary adrenal insufficiency causing insufficient production of cortisol and aldosterone. Symptoms include fatigue, weight loss, hyperpigmentation, low blood pressure, and salt craving; lifelong hormone replacement is required.

Hemochromatosis (Iron Overload)

Hereditary hemochromatosis is a genetic disorder causing excessive iron absorption and accumulation in organs (liver, heart, pancreas, joints), leading to cirrhosis, cardiomyopathy, and diabetes. Therapeutic phlebotomy is the standard treatment.

Ovarian Cysts

Ovarian cysts are fluid-filled sacs on or in the ovary, most of which are benign and resolve spontaneously. Symptomatic cysts cause pelvic pain, bloating, and pressure; large or persistent cysts may require surgical evaluation.

Preeclampsia

Preeclampsia is a pregnancy complication characterized by hypertension and proteinuria after 20 weeks gestation, potentially progressing to eclampsia (seizures) and multi-organ failure. Delivery is the definitive treatment; low-dose aspirin is preventive in high-risk women.

Mast Cell Activation Syndrome

MCAS involves recurrent episodes of mast cell mediator release causing allergic-type symptoms (flushing, urticaria, hypotension, GI symptoms, anaphylaxis) without consistent triggers. Antihistamines and mast cell stabilizers are the foundation of treatment.

Hereditary Angioedema

Hereditary angioedema is a rare genetic disorder causing recurrent episodes of severe swelling in the skin, GI tract, and airways due to C1-inhibitor deficiency. Laryngeal attacks can be fatal; specific treatments (icatibant, C1-INH concentrate) are available.

Giardiasis

Giardiasis is a common intestinal infection caused by the protozoan parasite Giardia lamblia, transmitted through contaminated water or food. It presents with chronic diarrhoea, bloating, and malabsorption, and is treated with metronidazole or tinidazole.

Enterobiasis (Pinworm Infection)

Enterobiasis is the most common helminthic infection in temperate countries, caused by Enterobius vermicularis. It predominantly affects children and presents with intense nocturnal perianal itching. Treatment is with mebendazole or albendazole.

Ascariasis

Ascariasis is the most prevalent human helminthic infection worldwide, caused by Ascaris lumbricoides. It can cause pulmonary symptoms during larval migration and intestinal obstruction in heavy infections. Albendazole is the drug of choice.

Echinococcosis (Hydatid Disease)

Echinococcosis is caused by larval stages of Echinococcus tapeworms, forming slowly growing cysts primarily in the liver and lungs. It is acquired from contact with infected dogs or contaminated food. Surgical removal and albendazole are the main treatments.

Taeniasis (Tapeworm Infection)

Taeniasis is intestinal infection by Taenia solium or Taenia saginata tapeworms, acquired by eating undercooked pork or beef. Symptoms include abdominal discomfort and weight loss. Neurocysticercosis (T. solium larvae in the CNS) is the most severe complication. Praziquantel is curative.

Strongyloidiasis

Strongyloidiasis is caused by Strongyloides stercoralis, a soil-transmitted nematode capable of autoinfection and chronic persistence for decades. In immunocompromised patients, hyperinfection syndrome can be life-threatening. Ivermectin is the treatment of choice.

Food Poisoning

Food poisoning is an illness caused by consuming contaminated food or water. Symptoms typically begin within hours to days of exposure and range from mild discomfort to severe dehydration.

Lactose Intolerance

Lactose intolerance is the inability to fully digest lactose due to insufficient lactase enzyme production. It causes digestive symptoms after dairy consumption but is manageable.

Adrenal Insufficiency

Adrenal insufficiency occurs when adrenal glands fail to produce sufficient cortisol. Primary (Addison's disease) is from adrenal damage; secondary is from pituitary or hypothalamic dysfunction.

Pelvic Inflammatory Disease (PID)

PID is an infection of the female reproductive organs, usually caused by sexually transmitted bacteria. Untreated, it can lead to infertility, ectopic pregnancy, and chronic pelvic pain.

Primary Biliary Cholangitis

Primary biliary cholangitis is a chronic autoimmune liver disease causing progressive bile duct destruction. Left untreated it leads to liver cirrhosis.

Hepatitis A

Hepatitis A is a highly contagious liver infection caused by the hepatitis A virus, transmitted through contaminated food and water. Unlike hepatitis B and C, it does not cause chronic disease.

Salmonella Infection

Salmonellosis is a common bacterial food poisoning caused by Salmonella bacteria. It typically causes diarrhea, fever, and stomach cramps beginning 12-72 hours after infection.

Food Allergy

Food allergies are immune system reactions that occur after eating a specific food. Even trace amounts can trigger signs and symptoms, including digestive problems, hives, or swollen airways.

Mast Cell Activation Syndrome

Mast cell activation syndrome causes recurring episodes of anaphylaxis-like symptoms due to inappropriate mast cell activation. Diagnosis requires demonstration of abnormal mediator release.

Autoimmune Hepatitis

Autoimmune hepatitis is chronic liver inflammation where the immune system attacks liver cells. It can lead to cirrhosis if untreated but generally responds well to immunosuppressive therapy.

Non-Alcoholic Fatty Liver Disease

NAFLD is excessive fat buildup in the liver of people who drink little or no alcohol. It ranges from simple steatosis to non-alcoholic steatohepatitis (NASH) with inflammation and fibrosis.

Diverticulitis

Diverticulitis occurs when small pouches (diverticula) that form in the digestive tract become inflamed or infected. It causes abdominal pain and can lead to serious complications.

Ectopic Pregnancy

An ectopic pregnancy occurs when a fertilised egg implants outside the uterus, most commonly in a fallopian tube. It cannot develop normally and is a medical emergency — if the tube ruptures, life-threatening internal bleeding can occur.

Ovarian Torsion

Ovarian torsion is the twisting of an ovary around its supporting ligaments, cutting off its blood supply. It causes sudden, severe pelvic pain and is a gynaecological emergency requiring urgent surgical intervention to preserve the ovary.

Diabetic Ketoacidosis

Diabetic ketoacidosis (DKA) is a life-threatening complication of diabetes in which the body produces dangerously high levels of blood acids called ketones. It most commonly affects people with type 1 diabetes and requires emergency treatment.