Health is one of the most obvious and important issues preoccupied the human mind, as a concern which still is in force. Maintaining health requires health-related information which is found in the informative resources of the relevant area. Web space is considered as a multi-functional and multi-directional sources of information in which the quantity of presented information is increasing day by day, so that it seems it would be a challenge to accuracy of information in relation to health system since people can publish the content freely without any supervision in weblogs and social networks and cite to outdated articles and commercial, advertising sites which may not be scientifically validated. The number of people around the world using the internet was more than 2.5 billion in 2013 which is expected to reach 4 billion currently. Using health information in this way, even before visiting a doctor, is dramatically increasing, as it has been reported that about 70% of the adults in Europe and 90% in America seek help from health information on the web [1-2].