Ovarian cancerImportant but uncommon causes of abdominal bloating include:

Large cancerous intra-abdominal tumors of the ovary, liver, uterus and stomach
Megacolon, an abnormal dilation of the colon caused by some diseases, such as Chagas disease, a parasitic infection
Cardiopulmonary resuscitation procedures, due to the artificial mouth-to-mouth insufflation of air.In animals, causes of abdominal bloating include:

Gastric dilatation volvulus, a condition of dogs which occurs when gas is trapped inside the stomach and gastric torsion prevents it from escaping
Ruminal tympany, a condition of ruminant animals which occurs when gas cannot escape from the rumen.All the factors mentioned contribute to bloated stomach abdominal pain. Every person produces gases in their body during the digestion of food, such as methane, hydrogen, carbon dioxide, and nitrogen. And some of them are released outside the body, sometimes in small quantities that one does not notice and sometimes in larger quantities that may affect the normal course of life. Fiber
Most cases of stomach bloating are due to improper diet. Gas occurs because of the bacteria in the colon and is a by-product of soluble fiber digestion. Inadequate or irregular intake of fiber and water will cause a person to experience bloating or constipation. The most common natural sources of fiber include fruits and vegetables as well as wheat or oat bran. These fibers are most likely to cause flatulence. Fiber is made by plants and is not easily digested by the human gastrointestinal tract. There are two main types of dietary fiber: soluble and insoluble fiber.
Ganglioneuroma is a rare and benign tumor of the autonomic nerve fibers arising from neural crest sympathogonia, which are completely undifferentiated cells of the sympathetic nervous system. However, ganglioneuromas themselves are fully differentiated neuronal tumors that do not contain immature elements.Ganglioneuromas most frequently occur in the abdomen, however these tumors can grow anywhere sympathetic nervous tissue is found. Other common locations include the adrenal gland, paraspinal retroperitoneum, posterior mediastinum, head, and neck. It is contained within the neuroblastic tumors group, which includes: Ganglioneuroma (benign), Ganglioneuroblastoma (intermediate), Neuroblastoma (aggressive). Symptoms and signs
A ganglioneuroma is typically asymptomatic, and is typically only discovered when being examined or treated for another condition. Any symptoms will depend upon the tumors location and the nearby organs affected.For example, a tumor in the chest area may cause breathing difficulty, chest pain, and trachea compression. If the tumor is located lower in the abdomen, it may cause abdominal pain and bloating. A tumor near the spinal cord may cause spinal deformity or spinal compression, leading to pain and loss of muscle control or sensation in the legs and/or arms.These tumors may produce certain hormones, which can cause diarrhea, an enlarged clitoris (in females), high blood pressure, increased body hair, and sweating. Cause
There are no known risk factors for ganglioneuromas. However, the tumors may be associated with some genetic problems, such as neurofibromatosis type 1. Pathology
Pathologically, ganglioneuromas are composed of ganglion cells, Schwann cells and fibrous tissue. Ganglioneuromas are solid, firm tumours that typically are white when seen with the naked eye.