Travel in Haiti is generally safe as long as you’re reasonably careful about what you eat and drink. The most common travel-related illnesses, such as dysentery and hepatitis, are acquired by consumption of contaminated food and water. There is a small but significant malaria risk in certain parts of the country, and you should check before travel as to required prophylaxis. Following the 2010 earthquake, Haiti suffered a widespread cholera outbreak.
Consider obtaining malaria pills and vaccinations for hepatitis A and B and typhoid. Also be sure your tetanus vaccine is up to date.
Travel insurance that includes health coverage is highly recommended. Policies vary widely, but it’s essential to have as much medical coverage as possible (including emergency evacuation cover). Medical services insist on payment on the spot, so collect all the paperwork you can when being treated so you can claim later. Some policies ask you to call them (they’ll usually call you back) so that an assessment of your problem can be made.
In Haiti, medical services are limited and care can be substandard. Expect to pay cash for services, and consider being evacuated to another country should you sustain a serious injury.
In Haiti, poor sanitation spreads infectious diseases through the water supply, cholera included. Drink bottled water only.