Researchers on PubMed Health report that bacteria, viruses, or parasites are often to blame for gastroenteritis symptoms. In cases of severe gastroenteritis, you may have extreme abdominal pain with vomiting, headaches, fever, and chills.3
The journal Viruses stated that viral infections like the rotavirus or norovirus will cause bouts of mild to severe diarrhea.4
A potentially serious complication of gastroenteritis is dehydration. This means that along with nausea, diarrhea, and stomach pain, you may pass dark urine and feel fatigued all the time.5
Tapeworm infections or other intestinal parasites can also cause abdominal discomfort and other signs of gastroenteritis.
Food poisoning
Consuming contaminated food or drink can cause stomach infections that result in severe nausea and stomach pain. Very often, food poisoning causes you to start throwing up frequently as your body tries to get rid of the poisons.
The book Medical Microbiology reports that Salmonella can cause severe bouts of epigastric pain (pain below the ribs). The upper abdominal pain is usually accompanied by extreme nausea that results in vomiting. The most common symptom of food poisoning is diarrhea that may become explosive.6
Stomach aches and pain along with nausea can last between 2 and 7 days. In some cases, the stomach sickness is accompanied by bloody diarrhea, mucus in the stool, and leukocytes in your poop.
