This thesis deals with suitable pain assessment tools for people with dementia in long-term care facilities. Worldwide approximately 47 million people suffer from dementia. By 2050 this number will nearly triple. People with dementia require adequate care, which includes optimal pain assessment. Not or insufficiently treated pain can lead to behavioral problems, psychological and physical symptoms or augment them. Because of the limited ability to communicate and think over the course of the disease pain assessment becomes a key challenge for caregivers. So, to give people with dementia freedom from pain, accurate pain assessment is required to ensure successful pain management. The theoretical section of this thesis deals with the basics of dementia and pain. Subsequently the result section discusses problems with pain assessment in people with dementia, effects of pain on the behavior of people with dementia and appropriate pain assessment tools.