Abdominal distension

abdominal distentiondistensiondistendeddistended abdomenbloated stomachdistended stomachgas distensionswelling of the abdomenswollen belly
Abdominal distension occurs when substances accumulate in the abdomen causing its expansion.wikipedia
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Bloating

bloatedabdominal bloatinggas
People suffering from this condition often describe it as "feeling bloated".
Although this term is usually used interchangeably with abdominal distension, these symptoms probably have different pathophysiological processes, which are not fully understood.

Flatulence

fartflatusflatulent
Through a variety of causes (see below), bloating is most commonly due to buildup of gas in the stomach, small intestine or colon. The pressure sensation is often relieved, or at least lessened, by burping (belching) or farting (flatulence).
These definitions highlight that many people consider "bloating", abdominal distension or increased volume of intestinal gas to be synonymous with the term flatulence (although this is technically inaccurate).

Irritable bowel syndrome

IBSbowelirritable bowel
Other causes of bloating include inflammatory bowel diseases such as Crohn's disease and ulcerative colitis, irritable bowel syndrome, diabetes, functional dyspepsia or transient constipation.
There may also be urgency for bowel movements, a feeling of incomplete evacuation (tenesmus), bloating, or abdominal distension.

Coeliac disease

celiac diseasecoeliacceliac
Celiac disease
Classic symptoms include gastrointestinal problems such as chronic diarrhoea, abdominal distention, malabsorption, loss of appetite and among children failure to grow normally.

Constipation

constipatedobstipationchronic constipation
Other causes of bloating include inflammatory bowel diseases such as Crohn's disease and ulcerative colitis, irritable bowel syndrome, diabetes, functional dyspepsia or transient constipation.
Other symptoms related to constipation can include bloating, distension, abdominal pain, headaches, a feeling of fatigue and nervous exhaustion, or a sense of incomplete emptying.

Ascites

ascitic fluidperitoneal effusionascitic
Ascites
Mild ascites is hard to notice, but severe ascites leads to abdominal distension.

Eosinophilic gastroenteritis

eosinophilic enteritis
Eosinophilic gastroenteritis
EG typically presents with a combination of chronic nonspecific GI symptoms which include abdominal pain, diarrhea, occasional nausea and vomiting, weight loss and abdominal distension.

Bowel obstruction

intestinal obstructionobstructionsmall bowel obstruction
In rare cases, bloating may occur in individuals who have milk intolerance (lactose intolerance), parasite infections like giardia, food poisoning (bacteria), celiac disease, severe peptic ulcer disease, bowel obstruction or after certain types of abdominal surgery.
Depending on the level of obstruction, bowel obstruction can present with abdominal pain, swollen abdomen, abdominal distension, vomiting, fecal vomiting and constipation.

Nausea

nauseousvomitingfeeling of sickness
Sufferers often experience a sensation of fullness, abdominal pressure and possibly nausea, pain or cramping.

Cramp

crampsmuscle crampscramping
Sufferers often experience a sensation of fullness, abdominal pressure and possibly nausea, pain or cramping.

Thoracic diaphragm

diaphragmdiaphragmatichemidiaphragm
In the most extreme cases, upward pressure on the diaphragm and lungs can also cause shortness of breath.

Lung

lungspulmonaryright lung
In the most extreme cases, upward pressure on the diaphragm and lungs can also cause shortness of breath.

Stomach

gastricfunduscardia
Through a variety of causes (see below), bloating is most commonly due to buildup of gas in the stomach, small intestine or colon.

Small intestine

small bowelsmall intestinessmall
Through a variety of causes (see below), bloating is most commonly due to buildup of gas in the stomach, small intestine or colon.

Large intestine

coloncolorectallarge bowel
Through a variety of causes (see below), bloating is most commonly due to buildup of gas in the stomach, small intestine or colon.

Burping

belchbelchingburp
The pressure sensation is often relieved, or at least lessened, by burping (belching) or farting (flatulence).

Swallowing

deglutitionswallowedswallow
Experts believe that a major cause of abnormal bloating is excessive eating and air swallowing, known as aerophagia.

Aerophagia

aerophagySwallowing airSwallowing of air
Experts believe that a major cause of abnormal bloating is excessive eating and air swallowing, known as aerophagia.

Inflammatory bowel disease

inflammatory bowel diseasesIBDindeterminate colitis
Other causes of bloating include inflammatory bowel diseases such as Crohn's disease and ulcerative colitis, irritable bowel syndrome, diabetes, functional dyspepsia or transient constipation.

Crohn's disease

Crohn’s diseasechronCrohn
Other causes of bloating include inflammatory bowel diseases such as Crohn's disease and ulcerative colitis, irritable bowel syndrome, diabetes, functional dyspepsia or transient constipation.

Ulcerative colitis

Colitiscolitis ulcerosainflammatory colitis
Other causes of bloating include inflammatory bowel diseases such as Crohn's disease and ulcerative colitis, irritable bowel syndrome, diabetes, functional dyspepsia or transient constipation.

Diabetes mellitus

diabetesdiabeticdiabetics
Other causes of bloating include inflammatory bowel diseases such as Crohn's disease and ulcerative colitis, irritable bowel syndrome, diabetes, functional dyspepsia or transient constipation.

Lactose intolerance

lactose intolerantlactose-intolerantlactase deficiency
In rare cases, bloating may occur in individuals who have milk intolerance (lactose intolerance), parasite infections like giardia, food poisoning (bacteria), celiac disease, severe peptic ulcer disease, bowel obstruction or after certain types of abdominal surgery.

Parasitism

parasiteparasiticparasites
In rare cases, bloating may occur in individuals who have milk intolerance (lactose intolerance), parasite infections like giardia, food poisoning (bacteria), celiac disease, severe peptic ulcer disease, bowel obstruction or after certain types of abdominal surgery.