Most visitors travel to Colombia without incident, but there are certain medical conditions to be aware of and several things you can do to prevent sickness. Most illnesses are the result of Colombia's tropical-zone location. If traveling anywhere along the coast or jungle, you can bank on little tropical nuisances – infected bug bites, rashes or heat exhaustion. Other, more dangerous afflictions, including malaria and yellow fever, can strike travelers who get further off the beaten track or spend a lot of time trekking through national parks.
Dengue fever and the recent mosquito-borne threats, chikungunya, which arrived in 2014 on Colombian shores, and zika, which hit the country hard in 2016, are a risk in lowland population centers although the epidemic has passed and not many cases are being reported at present. Other problems can occur in the mountains, including soroche (altitude sickness).
The good news is that Colombia has some of the best medical care in South America.
Altitude sickness may develop in travelers who ascend rapidly to altitudes greater than 2500m, including those flying directly to Bogotá.