
An upset tummy, also sometimes called an upset stomach or a stomach ache, refers to discomfort or pain in the abdominal area.
An upset tummy is a symptom of many different conditions. Common causes of an upset tummy include:
- Overeating
- Consuming fatty and greasy foods
- Spicy or greasy foods
- Eating meals too quickly
- Too much caffeine, alcohol, or chocolate
- Smoking
- Antibiotics, pain relievers, and supplements
- Gas
- Constipation
- Nausea
- Vomiting
- Indigestion
- Heartburn
- Stomach flu
- Migraine
- Motion sickness
- Morning sickness during pregnancy
- Food poisoning
- Allergic reactions
- Stress
Serious conditions that may cause an upset tummy can include:
- Appendicitis
- Celiac disease
- Crohn’s disease
- Diverticulitis
- Gallstones
- Irritable bowel syndrome
- Ulcers
- Depression or anxiety
What Are Symptoms of an Upset Tummy?
Symptoms of an upset tummy include:
- Discomfort or pain in the abdomen
- Heartburn
- Bloating
- Belching
- Feeling full quickly after eating
- Nausea
How Is an Upset Tummy Diagnosed?
- Most cases of upset tummy are mild and self-limiting and able to be treated at home.
- The cause of more serious cases of upset can be diagnosed with a patient history of symptoms and a physical examination of the abdomen, which may include palpation of the area to check for tenderness, enlarged organs, or masses, and listening to the abdomen with a stethoscope for bowel sounds.
- Pregnancy should be ruled out in all females of childbearing age with abdominal pain.
How Do You Get Rid of A Stomach Ache?
Most of the time, an upset stomach can be treated at home. An upset tummy may be settled by:
- Drinking plenty of fluids so urine is a pale yellow or clear color
- Consuming clear liquids in frequent, small amounts
- If vomiting occurs, start with small sips of water or sucking on ice chips and if these are well tolerated, try:
- If fluids are tolerated, bland solid foods may be slowly added, such as the BRAT diet:
- Bananas
- Rice, white
- Applesauce
- Toast, plain or with only jelly or honey if desired
- Avoid:
- Spicy foods
- Fatty or greasy foods
- Dairy products
- Whole grains
- Raw vegetables
- Caffeine
- Alcohol
Over-the-counter (OTC) medications may help relieve certain symptoms associated with an upset tummy. Talk to your doctor to determine which medicine might be indicated in your situation.
- Simethicone (Gas-X, Mylanta) for gas and bloating
- Antacids or acid reducers (Pepcid, Zantac) for gastroesophageal reflux disease (GERD)
- Loperamide (Imodium) or bismuth subsalicylate (Pepto-Bismol) for diarrhea
- Stool softeners or laxatives for constipation
- Acetaminophen (Tylenol), ibuprofen (Advil, Motrin), or naproxen (Aleve) for cramping pain
If an upset tummy is caused by a specific medical problem, such as an ulcer, treatments for that problem can help relieve symptoms.
From 
https://www.uptodate.com/contents/stomach-ache-and-stomach-upset-the-basics?search=upset%20stomach&source=search_result&selectedTitle=1~150&usage_type=default&display_rank=1
https://www.unitypoint.org/livewell/article.aspx?id=c2a97765-27a7-40f0-a650-59e7720d10ce
https://www.uhs.wisc.edu/medical/upset-stomach/
https://www.uptodate.com/contents/evaluation-of-the-adult-with-abdominal-pain