Book excerpt: ICHSMT’21 is the fifth version of the International Congress of Health Sciences and Medical Technologies. The congress attended the success of regrouping a multidisciplinary community working with the challenge to add a relevant increment to the medical innovation and findings. The congress is a successor of four successful versions established respectively in 2016 (at Tlemcen University Algeria), 2017 (at Mariott Hotel Tlemcen Algeria), 2018 (at CERIST Algiers Algeria), and 2019 (at Zianides Hotel Tlemcen Algeria). After several delay and for the first time, an online edition was established due to critical situation of worldwide pandemic, which make the end of millions of peoples life. The congress is held between 27 and 29 June 2021, only online but the organization was at Tlemcen. The congress at that edition attracted researchers from several nations and specialties naming: Algeria, Germany, Iran, Switzerland, Netherland, Denmark, Malaysia, China, Portugal, Bulgaria, Pakistan, France, Morocco, Tunisia, Brazil, United Kingdom, Egypt, India, Poland Iraq, and Kingdom of Saudi Arabia. The congress author’s affiliations were from several departments such as medicine, biology, physics, chemical sciences, computer science, environment, pharmacy, dentary surgery, electrical and electronic engineering, and mechanical engineering. The content was selected via strong criteria applied by the members of program committee. We received 63 submissions, which were reviewed by 2-3 reviewers, and we accepted 59, the rate of acceptance was 80.95%. Only some abstracts are selected for publication in this book.