Enteritis as gastroenteritis. Signs and symptoms of enteritis are highly variable and vary based on the specific cause and other factors such as individual variance and stage of disease. Symptoms may include abdominal pain, cramping, diarrhoea, dehydration, fever, nausea, vomiting and weight loss. Crohn's disease – also known as regional enteritis, it can occur along any surface of the gastrointestinal tract. In 40% of cases it is limited to the small intestine. Coeliac disease – caused by an autoimmune reaction to gluten by genetically predisposed individuals. Eosinophilic enteropathy – a condition where eosinophils build up in the gastrointestinal tract and blood
Neoteny in humans weakening of the immune system from upper body musculature competing with the immune system over nutrients. It is argued that the genetic evidence of only a small part of the male population of the time of early agriculture passing on their Y chromosomes can be explained by the heredity of non-neotenic traits causing the male descendants of the non-neotenic men who were not killed by diseases in one generation to die from them in subsequent generations, leaving no Y chromosome evidence of their short term continuation of paternal bloodlines in present humans. Sexual selection for stereotypic masculinity causing most men