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.

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.

Gastroenteritis

stomach flucholera morbusinfectious diarrhea
Common causes of pain in the abdomen include gastroenteritis and irritable bowel syndrome. Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis 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%).
Symptoms may include diarrhea, vomiting, and 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.

Gastritis

acute gastritischronic gastritisgastritis with low acidity
Inflammatory: gastroenteritis, appendicitis, gastritis, esophagitis, diverticulitis, Crohn's disease, ulcerative colitis, microscopic colitis 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%).
There may be no symptoms but, when symptoms are present, the most common is upper abdominal pain.

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.

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.

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.

Cholecystitis

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

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.

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.

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.

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.

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.

Indigestion

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

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.

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.

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.

Acute abdomen

acute abdominal painabdomenabdomen, acute
Acute abdomen can be defined as severe, persistent abdominal pain of sudden onset that is likely to require surgical intervention to treat its cause.
An acute abdomen refers to a sudden, severe 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.

Lead poisoning

leadlead contaminationlead exposure
uremia, diabetic ketoacidosis, porphyria, C1-esterase inhibitor deficiency, adrenal insufficiency, lead poisoning, black widow spider bite, narcotic withdrawal
Symptoms may be different in adults and children; the main symptoms in adults are headache, abdominal pain, memory loss, kidney failure, male reproductive problems, and weakness, pain, or tingling in the extremities.