what causes diarrhea

Diarrhea can indeed be caused by a wide range of factors, so it’s understandable that you’re feeling overwhelmed by the possibilities. The most common culprits include viral infections — often called stomach viruses or gastroenteritis — which can indeed cause symptoms for over a week. These typically resolve on their own, but persistent diarrhea that lasts longer might require more investigation. Sometimes, it’s a reaction to a medication you’re taking, particularly antibiotics, which can disrupt your gut’s normal bacterial balance. Food intolerances or allergies, such as lactose intolerance, can also result in similar symptoms. Then there’s the possibility of bacterial infections from contaminated food or water, like salmonella or E. coli, which can be more severe and occasionally require antibiotics to clear up. Since you’ve already seen a doctor and had some preliminary tests, that’s a good first step. If symptoms persist, it’s worth following up and maybe exploring tests for parasites like Giardia, which can cause prolonged diarrhea, especially if you’ve recently traveled. It’s wise to monitor any other symptoms, like weight loss or blood in the stool, as those could signal more serious conditions like inflammatory bowel disease (IBD) or irritable bowel syndrome (IBS) — though IBS usually involves a pattern of both constipation and diarrhea over a longer period. Managing stress and staying hydrated are crucial; diarrhea can lead to dehydration. If you become dizzy or have high fever, it’s important to seek immediate medical attention. Keep a detailed food diary and note any patterns or triggers; this information can be valuable for your healthcare provider in narrowing down the cause. Eating a bland diet — think bananas, rice, applesauce, toast (the BRAT diet) — can sometimes help while you’re figuring this out. Avoid caffeine, alcohol, and dairy until symptoms improve, and consider a probiotic supplement to support gut health. If after reviewing your lifestyle, diet, and a follow-up with the doctor doesn’t reveal a clear cause or provide relief, comprehensive testing including stool samples, blood tests, or even colonoscopy might be warranted to explore diagnoses like celiac disease, chronic infections, or malabsorption issues.