Diarrhoea is caused by viral infections, bacterial infections, or parasitic infestation. These pathogens typically reach the large intestine after entering orally, through ingestion of contaminated food or water and oral contact with contaminated objects or hands, and cause diarrhoea.
The best way to avoid Diarrhoea is to not eat food from unhygienic places, avoid drinking water and uncooked foods like salads outside, make sure you don't eat food that is heated and reheated several times, and never forget to wash hands with soap and water several times a day, especially before eating, after using the toilet, and after handling pets.
Diarrhoea can be managed by maintaining fluids by using oral rehydration therapy. If there is too much vomiting or diarrhoea, hospital admission may be required for intravenous fluid replacement. In severe cases it can lead to shock (low blood pressure), kidney failure.