Historically, Belarus maintained an excellent health system. Ambulances are poorly equipped and unreliable; a wait time of 30 minutes or more is not unusual. The fastest way to secure Western-level care is medical evacuation to the European Union.
Tuberculosis TB is an increasingly serious health concern in Belarus. Vaccinations against this disease is highly recommended. You need to consult to a doctor first and get the vaccination before entering Belarus.
In Belarus, there is a big institute and lots of funding for studying the after effects of the Chernobyl disaster, which happened in 1986 in a nuclear power plant on the Ukraine-Belarus border, in the food chain. In principle, food inspectors check food not only for bacterial contamination but also for radiation levels, and except for the banned region within about 50 kilometers of the Chernobyl plant itself and a second hotspot starting from the point where Russia, Ukraine and Belarus all touch each other, and running roughly 100 km to the North of this point, food is considered safe.