Today world is facing more health challenges and one of the most challenging dangerous killing disease is cancer which can affect any person in any part of their body without any differentiations in age, sex, and colour etc ...Cancer is the abnormal, uncontrollable, continuous replication of cells which will inevitably lead to the formation of a tumor. Breast cancer is one of the common cancer affecting women, early detection with the help of breast self examination can help them to save their life from breast cancer. According to WHO, in 2018, world-wide it is estimated that 627,000 women died from breast cancer – that is approximately 15% of all cancer deaths among women. Statistics report published in Saudi Medical Journal by Faculty of Sciences, Department of Biology, University of Tabuk, Tabuk, KSA, shows that the number of women with breast cancer increased steadily from 1990-2010. The percentage distribution of breast cancer appears to be increasing. There were 1152 female cases in 2008 in comparison with 1308 in 2009, and 1473 in 2010. Breast cancer ranked first among females accounting for 27.4% of all newly diagnosed female cancers (5378) in the year 2010. The average age at the diagnosis of breast cancer was 48; weighted average was 49.8, and range 43-52., so we conducted A Quasi Experimental Study To Evaluate The Effectiveness Of Health Awareness Programme On Prevention Of Breast Cancer And Developing Skill On Breast Self Examination Among Women At Selected Area In Alnamas, Kingdom Of Saudi Arabia . 70 patients were selected by convenient sampling method.