Traveler's Diarrhea: This is the most common diagnosis for individuals experiencing diarrhea after travel, often caused by bacterial pathogens such as E. coli, Salmonella, Shigella, or Campylobacter, which are commonly found in contaminated food or water.

Viral Gastroenteritis: Viruses like norovirus or rotavirus can cause diarrhea and are often spread through contaminated food, water, or close contact with infected individuals.
Food Poisoning: Consuming spoiled, contaminated, or improperly cooked food can lead to diarrhea, with common culprits including Staphylococcus aureus, Bacillus cereus, and Clostridium perfringens.
Parasitic Infections: Giardiasis or amoebiasis can occur from consuming contaminated water or food, especially in areas with poor sanitation.

Cholera: Although less common, cholera is a life-threatening condition that can cause severe diarrhea and dehydration, particularly in travelers to areas where cholera is endemic.
Typhoid Fever: Caused by Salmonella Typhi, this condition can present with diarrhea, fever, and abdominal pain, and is critical to diagnose due to its potential severity and need for specific antibiotic treatment.
Inflammatory Bowel Disease (IBD) Exacerbation: For individuals with pre-existing IBD (Crohn's disease or ulcerative colitis), travel can sometimes trigger an exacerbation of symptoms, including diarrhea.

Cyclosporiasis: An intestinal infection caused by the Cyclospora parasite, often associated with consuming contaminated fresh produce.
Cryptosporidiosis: A diarrheal disease caused by the Cryptosporidium parasite, which can be found in contaminated water or food.
Brainerd Diarrhea: A rare condition characterized by chronic diarrhea with an unknown cause, sometimes linked to travel or consumption of specific foods.