A vasovagal response from straining to poop is what often causes you to throw up while having a bowel movement.
The vasovagal response slows your heart rate and drops your blood pressure and can result in you throwing up during a bowel movement.
Other possible causes of throwing up during having a bowel movement are a bowel obstruction, appendicitis, gastrointestinal infections or even food poisoning, certain medications, food allergies or intolerance's and even inflammatory bowel disease.
Straining when having a bowel movement can stimulate your Vagus nerve, which leads to a sudden drop in your blood pressure and your heart rate which is also known as defecation syncope.
This can then result in lightheadedness and dizziness and in some cases vomiting during the bowel movement.
The bowel disease that causes vomiting is Crohn's disease which is a type of inflammatory bowel disease.
Nausea and vomiting, especially after eating can be a symptom of irritable bowel syndrome or inflammatory bowel disease or Crohn's disease.
Crohn's disease can result in long term inflammation and can cause a stricture, which is the narrowing in your small intestine that can result in blockage over time.
The main symptoms of Crohn's disease include.
Crampy pain in your abdomen or belly area.
Fever.
Fatigue.
Loss of appetite and weight loss.
Feeling that you might need to pass poop, even though your bowels are already empty which is also known as tenesmus and it may also involve straining, pain and cramping.
And you may also have watery or loose diarrhea, which can also be bloody.
Other conditions that can cause vomiting are gastritis, appendicitis, pancreatitis, gastroparesis, GERD, Bowel Obstruction, cyclic vomiting syndrome, food poisoning, Norovirus, gallbladder problems, kidney failure and peptic ulcer disease.
Gastritis is inflammation of your stomach lining.
Appendicitis is inflammation of your appendix, which often causes severe abdominal pain and appendicitis is an emergency as a ruptured appendix can kill you.
Pancreatitis is inflammation of your pancreas, which can cause abdominal pain, loss of appetite and vomiting.
Crohn's disease is an inflammatory disease that affects your digestive tract.
Gastroparesis is a condition in which your stomach empties too slowly due to nerve damage.
GERD is also known as gastroesophageal reflux disease and is when stomach acid repeatedly flows back into your esophagus.
Bowel obstruction is a blockage that can prevent food and liquid from passing through your intestines and is a medical emergency.
Cyclic vomiting syndrome is a condition that causes episodes of severe nausea and vomiting.
Food poisoning can result in vomiting due to toxins from bacteria in spoiled food or contaminated food like Bacillus cereus and Staphylococcus aureus.
Norovirus is a common stomach bug which can cause vomiting and diarrhea.
And gallstones and gallbladder attacks can result in vomiting and nausea and peptic ulcer disease are sores on the lining of your stomach or intestine and can also result in vomiting.