Can black fly bites cause swollen lymph nodes and diarrhea?

Black fly bites can indeed cause swollen lymph nodes and diarrhea in some cases. It is important to monitor your symptoms and stay hydrated. Eating light, easy-to-digest foods like crackers, soups, and eggs may help. Avoid heavy or sugary foods like red meat, undiluted fruit juices, and milk. If your symptoms persist for more than a week or worsen, it would be wise to consult a doctor for proper evaluation and treatment.