A continuous feeling of filled up stomach and flatulence is an associated symptom of the disease. Gas is formed within the stomach during gastroenteritis due to indigestion. This is expelled out by the sufferer in the form of burping, belching and flatulence. This is accompanied by diarrhea. The occurrence of infection in the digestive tract impairs the normal functions of the various digestive organs. This makes them incapable of assimilating the food that is consumed. The incapability to break down one or more nutrients found in the undigested food reacts internally and form gases. Hence, stomach ache and cramping are caused as gas exerts pressure on the walls of the digestive organs and tend to expand them.

In a severe case of gastroenteritis, the patient may discharge stool that is black or dark brown in color. This situation must be taken with concern as the color of stool indicates the presence of blood in it. It signifies that the infection has spread quite extensively within the digestive tract. Researches suggest that most of the times the blood expulsion with stool is due to the presence of infectious amoeba like Campylobacter, Salmonella, Shigella, and Escherichia coli.

Mild to severe fever is common during gastroenteritis. When the body gets attacked by the germs that cause gastroenteritis, the victim suffers from mild fever. As the germs spread the infection further the disease gets intensified. This causes the rising up of body temperature further, which crosses 101 degrees F at times. The only prevention during such a condition is immediate medical treatment. Paracetamol is administered along with antibiotics that curb the effect of the germs inside the digestive tract. The medicines cure fever and restrict the germs from spreading the infection any further.

A crumbling feeling and cramping in the abdomen is a vital symptom of gastroenteritis. It occurs all of a sudden and the person has an urge of bowel movement preceding this. Most of the times the bowel movement is not clear and a sore feeling inside the stomach remains constantly active.

A feeling of vomiting is often experienced in the primary stages of the disease. It is often associated with nausea and dizziness. The symptom should be taken seriously, when vomiting continues for more than 48 hours. The growth of infection inside the gastrointestinal tract leads to vomiting. In cases when vomiting continues for a prolonged period, it can lead to excessive discharge of body fluid that causes dehydration. In severe conditions the patient needs to be given intravenous glucose.

There is a constant sense of incomplete evacuation during gastroenteritis. Thus, the victims feel like going to the loo repeatedly in order to clear their bowel. This feeling of going to the toilet is seen mostly after having a meal. In such occasion, bowel clearance method can be used, but most of the situations go without any bowel clearance at all.

One of the most significant symptoms of gastroenteritis is diarrhea. It is the initial symptom that aggravates further if the condition remains untreated. The cause of diarrhea on occasion of gastroenteritis is propagation of infection inside the body. The germs enter the food canal through the contaminated food and water. Then they irritate the internal part of the digestive system as well as the stomach. Thus, through repeated loose motion, the electrolytes, fluid, and salt present in the body flows out and makes the victim weak and frail due to severe dehydration.