I was a Peace Corps Volunteer in Togo, French West Africa for two years, and absolutely loved it!! The experience did far more for and to me, than our Health Team did for them I'm sure in the short time we were there.
But this was at a time when the world was "relatively" safe and terrorism was in the embryonic stage. The only real threat at that time was tribal infighting, so we were secure in that respect.
I suppose a lot of it depends on why a person decides to do such a thing as you propose: altruistic reasons? pure adventure and the excitement of doing it? just the challenge?, etc. etc.
Our Health Team was comprised of three of us: me (the Nurse person), another girl (well-educated and couldn't decide what she wanted to do in life), and a guy from Florida who was a Lawyer!! We were given a huge box of basic medical supplies......vitamins, antibiotics, anti-malaria pills, DPT immunizations, de-worming meds (for parasites), dressing supplies, and a whole bunch of first-aid type stuff. We were then sent off to our "post" which was a little village 300 miles north of the Capitol (Lome, on the coast), which took us 8 days to get there by Jeep. The only paved road in the country was 6 miles long, due north, then after that it was 294 miles of dirt, mud, ruts, washboard road, and bicycle paths!
When we arrived we had a dirt-brick, tin roofed, "house" waiting for us in the village of a tribe of people who had never seen a "white" person before in their lives. In their native language they had no words for: "disease", "bacteria", "germs", etc. The concept of "healthy" was as foreign to them as we were. They had never heard of "America" or the "United States of....", and thought we were Europeans (from Germany, England or France).
Whenever one of them would spot a high flying commercial airline in the sky above, the entire village would come running, they would gather around, pointing up at the sky, excitedly and animatedly jabbing the air, shouting "something " at what they saw.
We started out by setting up two clinics a week and people came from everywhere. Everyone had malaria, malnutrition and were infested with all kinds of parasites. We dispensed a lot of pills and found out later that they would take the week's supply home, go to the nearest market (12 miles away) and sell them. We set up mass immunization programs for the babies, and discovered two years later that we had created a monster for them by saving the lives of the children because the mother's couldn't feed all of the surviving ones with only two breasts as a source of survival. What we learned was that in their setting the women had to go through a minimum of nine full-term pregnancies to be assured that even ONE would survive to the age of 5 years old, which was the age of certainty to reach adulthood for them.
Our arrival also set off an ongoing fued with the local witchdoctor who resented our being there.
I could go on and on about the experience. It has and always will remain as one of those "highlighted" places in my life. It did far more to impact me in ways I never dreamed were possible.
In today's world I would have to think very seriously about doing such a thing, for all the "new" reasons that are apparent.
Best of luck in whatever you decide to do.......