There are some important things to remember. Some illnesses like Malaria can harbour themselves in your body for many weeks or even months, it is important therefore to inform your doctor of any travel to exotic countries in the past 12 months. Typical symptoms of many tropical disease share common traits to disease found at home and include Fevers, Muscle Ache and Headaches. Other common signs to look for include diarrhoea, nausea, vomiting, lethargy, chronic fatigue or skin rashes. If you return from overseas and experience fevers, sweating, shivering, aches and pains and other flu like symptoms you should seek medical advice as soon as possible.
Malaria can be a serious disease if left untreated.
It is wiser to assume you have malaria until proven otherwise. Diarrhoea is common however if the problems persist you should seek medical attention. Also keep in mind the risk of dehydration and use oral re-hydration salts if required. Viruses, bacteria or parasites can cause diarrhoea. Travellers returning with persistent bowl problems often experience good days and bad days this is often a sign of bacterial infection from a disease like Cryptosporida .