Spreading of a disease with uncontrolled progress with mass mortality and damage is termed as 'epidemic' situation of that particular disease. From the ancient time of human history several incidences of epidemic outbreak has been occurred in different era. An amulet of Akkadian Erra Epic (800-612 BC) has been identified, where the incident of plague was inscribed with a quotation. Moreover, the teeth samples from seven 'Bronze age' (3000 BC) human have been found positive with the plasmid of Yersinia pestis-the bacterial pathogen responsible for Plague, which is believed to be the earliest evidence of 'epidemiological incidence' in the world [1]. Studies in epidemiological aspect of diseases are still relevant today as it helps to search the determinants of the issue and assists to find out the cause or influence of disease and other health-related events. The journal 'Epidemiology: Open Access' Volume 7, Issue 1, focussed varied topics of and discussion of research findings in this field. The authors in this issue have investigated the reason for the prevalence of thyroid dysfunction in female population of Saudi; reported main consequences and factors associated with low back pain in healthcare workers; evaluated the role of probable factors leading to the genesis of Alzheimer's disease; assessed the relation between socio-economic status and nutritional status and investigated the perceptions of young females. The study further assessed the factors associated with utilization of SRH services in Ambo town.The prevalence of thyroid disorder is increasing in all parts of the world. Ethnicity, geographical locations, age, sex and iodine-intake are considered as main reasons for the occurrence of thyroid disorders. Hasanato et al. [2], meticulously investigated the reasons for the prevalence of thyroid dysfunction in female population of Saudi. To assess this, they conducted cross sectional studies involving 199 female Saudi adults, visiting the King Khalid University Hospitals, Riyadh. This survey reported that lack of studies on the prevalence of thyroid dysfunction as main reason that resulted in high incidence of thyroid disorders among older females of Saudi. In addition vitamin D deficiency is also reported in majority of females, even though it is not related to thyroid disorder.Low back pain is a common problem face by almost all individuals at some point. This pain actually starts below the ribcage called the lumbar region. Abdulmujeeb et al. [3], studied the main consequences and factors associated with low back pain in healthcare workers. A cross sectional study was conducted and collected data was subjected for Epi info soft-ware and statistical data was analysed by using SPSS. This survey asseverated that, occupation designation and daily time spent to carry out these occupations are the medical and socioprofessional consequences of low back pain in healthcare workers.Alzheimer's and dementia are neurodegenerative disorder and millions of individuals are affected all over the globe, Pei [4], tried to...