eating too much or stress
what gives you an upset stomach is when you digest your food your food can rise up from the stomach from acid also known as gas building up in your stomach and so as it rises thats when you feel like you have and upset stomach.
no.
From past experiences it has almost always upset my stomach in a bad way.
MSG
Yes
it depends, if you work TOO hard you will get an upset stomach, along with if you are really dehydrated you may feel nauseas...
In most cases, patients with fibromyalgia are prescribed anti-inflammatory drugs. It is those drugs that cause the stomach upset.
If your stomach feels uneasy, simple things that could cause this include being nervous or anxious about something or having eaten something that might have disagreed with you. It could also be a 24 hour bug or stomach upset. Try to drink plenty of fluids and get some rest.
Unlikely
Green tea contains caffeine, a central nervous system (CNS) stimulant that can cause restlessness, irritability, difficulty sleeping, tremor, heart palpitations, loss of appetite, and upset stomach.
you dont really get butterflies in your stomach but when you feel weird in your stomach you might be nervous or sick. Because you are nervous or upset about something. Because your blood supply is being directed to somewhere 'more important' in your body
eating an iron