Why do you have diarrhea for more than three days?

There are many possible causes of diarrhea that lasts for more than three days. These include:

* Viral gastroenteritis: This is the most common cause of diarrhea, and it is caused by a variety of viruses, including norovirus, rotavirus, and sapovirus. Symptoms usually last for 1-3 days, but they can sometimes last for longer.

* Bacterial gastroenteritis: This is caused by bacteria, such as E. coli, Salmonella, and Shigella. Symptoms usually last for 1-7 days, but they can sometimes last for longer.

* Food poisoning: This can be caused by eating contaminated food or drink, and it can lead to symptoms such as diarrhea, vomiting, and abdominal pain. Symptoms usually last for 1-3 days, but they can sometimes last for longer.

* Antibiotic-associated diarrhea: This can occur after taking antibiotics, which can disrupt the normal balance of bacteria in the gut. Symptoms usually last for 1-3 days, but they can sometimes last for longer.

* Irritable bowel syndrome (IBS): This is a chronic condition that can cause symptoms such as diarrhea, constipation, and abdominal pain. Symptoms can come and go, and they can vary in severity.

* Ulcerative colitis: This is a chronic condition that causes inflammation of the large intestine. Symptoms can include diarrhea, bloody stools, and abdominal pain.

* Crohn's disease: This is a chronic condition that causes inflammation of the gastrointestinal tract. Symptoms can include diarrhea, abdominal pain, and weight loss.

* Colon cancer: This is a type of cancer that can occur in the colon or rectum. Symptoms can include diarrhea, constipation, and changes in bowel habits.

If you have diarrhea that lasts for more than three days, it is important to see a doctor to get a diagnosis and treatment. In some cases, diarrhea can be a sign of a serious underlying medical condition that needs to be treated.