There are no serious problems with diseases in the Maldives. Beware that tap water may not be drinkable at all resorts: enquire locally. The Maldives are malaria-free, but some islands do have mosquitoes and catching dengue fever from them is possible, albeit highly unlikely. For those coming from regions infected by yellow fever, an international certificate of inoculation is required.
Most of the problems come from diving or sun related injuries. Heat stroke always cause problems in the tropics but couple that with divers spending hours at a time on a boat wearing a wetsuit and overheating of one form or another is a real issue. Keeping this in mind, such injuries will be easily avoidable as long as you drink lots of water and get into the shade as much as possible.
Lots of the resorts have their own doctor or nurse and most are within easy reach of the decompression chambers. Male has an efficient and fairly modern hospital but bear in mind that it is a long way to get medevaced home from.
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