It depends on the health issue. You need to consider that field projects are normally quite demanding physically, with long hours of walking on the beach and some of the time under the sun, with excessive heat. Accommodation in most projects is in tents, in camping grounds with quite basic living conditions. If you are considering a participation in the Rescue center or the Amvrakikos Gulf project, remember that there is daily turtle lifting and transport of adult turtles weighing up to 80 kg daily. Finally, you may consider that living and interacting in an international environment with unknown people may cause stress to some people. For these reasons, you need to be completely sure that your health will not be affected by the project. This is why we definitely need a paper from your doctor, which will ensure that your health issue will not be affected by your participation.