Introduction. Gastroenteritis is a common condition where the stomach and intestines become inflamed. It is usually caused by a viral or bacterial infection. The two main symptoms of gastroenteritis are diarrhoea and vomiting.Read more about the symptoms of gastroenteritis.astroenteritis can also have a number of other causes, including a rotavirus infection, although this is more common in children. Read more about gastroenteritis in children.
Studies have shown that chronic pain might not only be caused by physical injury but also by stress and emotional issues. In particular, people who have experienced trauma and suffer from Post Traumatic Stress Disorder (PTSD) are often at a higher risk to develop chronic pain.
2. Endorphins. These are your natural pain killers that give you a high. Although more research is needed, there's no doubt that long periods of moderate to high intensity exercise, does have a happy affect on your emotions. 3. Fight or Flight. This is your natural reaction to any stressful situation. The problem is that much of today's stress doesn't require either physical fighting or running. But your body still provides the chemicals for it, which can be harmful if they remain.