Feeling sick to your stomach? Indigestion, gas, stomachache, bloating, nausea, diarrhea? Having an upset stomach (dyspepsia) or belly ache is not unusual. Most everyone has experienced this at some time in their lives, regardless of age or lifestyle. Generally it is caused from eating too much unhealthy food, too quickly. Most often the cause of stomach upset can be a problem specific to one of the many organs in your abdomen. What are the causes of dyspepsia and how can this be treated naturally?