One reason for the increasing number of triathlon related injuries can be found in the increasing popularity of triathlon during recent years. The main aim of this dissertation was the evaluation of the most frequent and common injuries in long distance triathlon. A special focus was put on identifying the links between training based risk factors and the most common symptoms. Data collection had been conducted via an online questionnaire that was translated into five different languages. The data analysis of the cross- sectional study 1159 questionnaires from 43 nations was the foundation of this thesis. The results were then compared and discussed using triathlon and discipline specific literature.In this study the main discomforts associated with swimming were located in the shoulder and were mostly tendon related. High training volume and a high amount of resistance training, as well as a lack of training concerning the swimming technique, are the main issues related with this problem. In cycling the shoulder can be seen as the region mostly affected by traumatic injuries. Concerning a- traumatic injuries the areas of the lumbar- and the cervical- spine are the most critical, followed by the genital and the knee area. Posture related problems, non- customized road bikes, and the lack of technical training in cycling, are the main risk factors for a- traumatic problems in this discipline. Running injuries associated with overload can mostly be traced back to Achilles tendinopathy, runners knee, iliotibial band friction syndrom, shin splints, plantar fasciitis and spinal- issues. Risk factors especially involve the age, stretching, the runners level, belt- training and the choice of running shoes.While the risk factors detected in this study can be compared to triathlon and discipline specific literature, a comparison of the frequency of occurrence concerning the most common symptoms can, due to varying reference parameters, only partially be made.