Health is an interesting and highly relevant subject today. Physical health is something we see everywhere, in newspapers, on tv and social media, what to eat, how to exercise etc. Mental health however is still taboo even though it’s a growing problem in today’s society. Mental health is associated with many problems in our society such as lower school result and depression. This paper compare how mental health is treated compared to physical health in upper secondary school literature. This comparison is made by a comparative and a thematic analysis of six books intended for the biology and nature science classes in Swedish high school. All investigated literature has a more comprehensive section when it comes to physical health compared to mental health. There is a positive trend where the newer literature has a more extensive mental health section compared to the older literature. It´s important to increase knowledge about mental health because it is one of the most important factors in increasing well-being, and increased well-being results in better school results. In the future it’s important to identify success factors for a successful health education.