Почему употребление чего-либо вызывает боль в животе?

It seems like you may be dealing with something known as appendicitis wherein your appendix gets inflamed thereby resulting into pain Other signs and symptoms may include but not limited to: loss of appetite, nausea or vomiting and fever . If you think that you have appendicitis then it’s important that you immediately seek for medical attention as this can lead to a medical emergency . Generally, surgery is required in removing the inflamed organ hence relieving the pain .

A slight burning sensation on the left side of the stomach can be caused by acid reflux, gastritis, peptic ulcers, gastrointestinal infections, indigestion, gas, or irritable bowel syndrome (Ibs). 

You might be having a dyspepsia, which is a disorder that often affects the upper part of your digestive system. Symptoms may range from bloating, gas, and nausea to abdominal pain and discontent. I suggest you go to a gastroenterologist to get the right diagnosis and treatment.
 

Experiencing pain, blood, and a burning sensation during or after a bowel movement could be due to various reasons such as anal fissures, hemorrhoids, inflammatory bowel disease, constipation, anal infections, or other concerns

Seek medical attention asap for proper evaluation and treatment. There are medications and treatments available for Hepatitis B that can help manage the virus and reduce the risk of long-term liver damage. Ensure to take steps to prevent the spread of the virus to others.

You might have an H. pylori infection. This bacteria can cause stomach pain, make your belly feel uncomfortable, and even cause a heavy head or cold sweats after meals. It can also lead to stomach ulcers. The good news is that it can be treated with a combination of antibiotics and acid-relief medication. Be sure to follow your doctor’s instructions and complete the full course of treatment to fully eliminate the bacteria. y.

At the junction between the small and large intestines, abnormal growth can occur, resembling a tube with an issue inside. This can cause stomach pain, changes in bowel movements, and sometimes bleeding. The cause is often inflammation or small growths (polyps). Treatment may involve surgery to remove the growth or medications to relieve symptoms.