Abdominal pain

stomach acheupset stomachstomachachestomach painabdominal discomfortepigastric painstomach achesabdominalabdominal crampsbilious colic
Abdominal pain, also known as a stomach ache, is a symptom associated with both non-serious and serious medical issues.wikipedia
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Irritable bowel syndrome

IBSbowelirritable bowel
Common causes of pain in the abdomen include gastroenteritis and irritable bowel syndrome. The most frequent reasons for abdominal pain are gastroenteritis (13%), irritable bowel syndrome (8%), urinary tract problems (5%), inflammation of the stomach (5%) and constipation (5%).
Irritable bowel syndrome (IBS) is a group of symptoms—including abdominal pain and changes in the pattern of bowel movements without any evidence of underlying damage.

Appendicitis

ruptured appendixacute appendicitisburst appendix
About 10% of people have a more serious underlying condition such as appendicitis, leaking or ruptured abdominal aortic aneurysm, diverticulitis, or ectopic pregnancy. Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis
Symptoms commonly include right lower abdominal pain, nausea, vomiting, and decreased appetite.

Gastroenteritis

stomach flucholera morbusinfectious diarrhea
Common causes of pain in the abdomen include gastroenteritis and irritable bowel syndrome. The most frequent reasons for abdominal pain are gastroenteritis (13%), irritable bowel syndrome (8%), urinary tract problems (5%), inflammation of the stomach (5%) and constipation (5%). Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis
Symptoms may include diarrhea, vomiting, and abdominal pain.

Ectopic pregnancy

ectopic pregnanciesectopictubal pregnancy
About 10% of people have a more serious underlying condition such as appendicitis, leaking or ruptured abdominal aortic aneurysm, diverticulitis, or ectopic pregnancy.
Signs and symptoms classically include abdominal pain and vaginal bleeding.

Gastritis

acute gastritischronic gastritisgastritis with low acidity
The most frequent reasons for abdominal pain are gastroenteritis (13%), irritable bowel syndrome (8%), urinary tract problems (5%), inflammation of the stomach (5%) and constipation (5%). Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis
There may be no symptoms but, when symptoms are present, the most common is upper abdominal pain.

Crohn's disease

Crohn’s diseasechronCrohn
Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis
Signs and symptoms often include abdominal pain, diarrhea (which may be bloody if inflammation is severe), fever, and weight loss.

Ulcerative colitis

Colitiscolitis ulcerosainflammatory colitis
Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis
The primary symptoms of active disease are abdominal pain and diarrhea mixed with blood.

Mesenteric ischemia

intestinal ischemiaischemic bowelmesenteric vascular occlusion
More common in those who are older, mesenteric ischemia and abdominal aortic aneurysms are other serious causes.
The chronic form typically presents more gradually with abdominal pain after eating, unintentional weight loss, vomiting, and fear of eating.

Endoscopy

endoscopicendoscopeendoscopes
Endoscopy and/or colonoscopy
Endoscopy may be used to investigate symptoms in the digestive system including nausea, vomiting, abdominal pain, difficulty swallowing, and gastrointestinal bleeding.

Volvulus

strangulationintestinal volvulusmidgut volvulus
Obstruction: hernia, intussusception, volvulus, post-surgical adhesions, tumors, severe constipation, hemorrhoids
Symptoms include abdominal pain, abdominal bloating, vomiting, constipation, and bloody stool.

Lactose intolerance

lactose intolerantlactose-intolerantlactase deficiency
Digestive: peptic ulcer, lactose intolerance, celiac disease, food allergies
Symptoms may include abdominal pain, bloating, diarrhea, gas, and nausea.

Abdominal angina

abdominal pain after eating a mealbowel angina
Vascular: embolism, thrombosis, hemorrhage, sickle cell disease, abdominal angina, blood vessel compression (such as celiac artery compression syndrome), superior mesenteric artery syndrome, postural orthostatic tachycardia syndrome
Abdominal angina is abdominal pain after eating that occurs in individuals with ongoing poor blood supply to their small intestines known as chronic mesenteric ischemia.

Cholecystitis

acalculous cholecystitisacute cholecystitisinflammation of the gall bladder
Inflammatory: cholecystitis, cholangitis
Symptoms include right upper abdominal pain, nausea, vomiting, and occasionally fever.

Hepatitis

liver inflammationchronic hepatitisacute hepatitis
Inflammatory: hepatitis, liver abscess
Some people have no symptoms whereas others develop yellow discoloration of the skin and whites of the eyes, poor appetite, vomiting, tiredness, abdominal pain, or diarrhea.

Ascending cholangitis

cholangitisacute cholangitisbiliary sepsis
Inflammatory: cholecystitis, cholangitis
Characteristic symptoms include yellow discoloration of the skin or whites of the eyes, fever, abdominal pain, and in severe cases, low blood pressure and confusion.

Thrombosis

blood clotsthromboticblood clot
Vascular: embolism, thrombosis, hemorrhage, sickle cell disease, abdominal angina, blood vessel compression (such as celiac artery compression syndrome), superior mesenteric artery syndrome, postural orthostatic tachycardia syndrome
This form of thrombosis presents with abdominal pain, ascites and enlarged liver.

Urinary tract infection

urinary tract infectionscystitisbladder infection
Inflammation: pyelonephritis, bladder infection, indigestion
Symptoms of a kidney infection include fever and flank pain usually in addition to the symptoms of a lower UTI.

Coeliac disease

celiac diseasecoeliacceliac
Digestive: peptic ulcer, lactose intolerance, celiac disease, food allergies
Abdominal pain and cramping, bloatedness with abdominal distension (thought to be due to fermentative production of bowel gas), and mouth ulcers may be present.

Indigestion

dyspepsiafunctional dyspepsiadyspeptic
Inflammation: pyelonephritis, bladder infection, indigestion
Symptoms may include upper abdominal fullness, heartburn, nausea, belching, or upper abdominal pain.

Superior mesenteric artery syndrome

mesenteric
Vascular: embolism, thrombosis, hemorrhage, sickle cell disease, abdominal angina, blood vessel compression (such as celiac artery compression syndrome), superior mesenteric artery syndrome, postural orthostatic tachycardia syndrome
Signs and symptoms include early satiety, nausea, vomiting, extreme "stabbing" postprandial abdominal pain (due to both the duodenal compression and the compensatory reversed peristalsis), abdominal distention/distortion, burping (eructation), external hypersensitivity or tenderness of the abdominal area, reflux, and heartburn.

Intussusception (medical disorder)

intussusceptionictusintro-susception
Obstruction: hernia, intussusception, volvulus, post-surgical adhesions, tumors, severe constipation, hemorrhoids
Early symptoms can include periodic abdominal pain, nausea, vomiting (sometimes green in color from bile), pulling legs to the chest area, and intermittent moderate to severe cramping abdominal pain.

Esophagitis

erosive esophagitisreflux esophagitisoesophagitis
Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis
Abdominal pain

Porphyria

porphyriasmadnessacute porphyria
uremia, diabetic ketoacidosis, porphyria, C1-esterase inhibitor deficiency, adrenal insufficiency, lead poisoning, black widow spider bite, narcotic withdrawal
Symptoms of an attack include abdominal pain, chest pain, vomiting, confusion, constipation, fever, high blood pressure, and high heart rate.

Diabetic ketoacidosis

ketoacidosisacidosisDKA
uremia, diabetic ketoacidosis, porphyria, C1-esterase inhibitor deficiency, adrenal insufficiency, lead poisoning, black widow spider bite, narcotic withdrawal
Signs and symptoms may include vomiting, abdominal pain, deep gasping breathing, increased urination, weakness, confusion, and occasionally loss of consciousness.

Hereditary angioedema

angioedemaC1INH deficiencyhereditary angeoedema
uremia, diabetic ketoacidosis, porphyria, C1-esterase inhibitor deficiency, adrenal insufficiency, lead poisoning, black widow spider bite, narcotic withdrawal
If the intestinal tract is affected abdominal pain and vomiting may occur.