Introduction The Internet is a frequently used tool for patients with pectus excavatum (PE) to get information about symptoms and treatment options. In addition, it is used by both health care providers as a marketing tool and support group systems. The Internet health information varies in precision, quality, and reliability. The study purpose was to determine the quality of information on the PE Web sites using the DISCERN instrument, including information about operation and potential complications after a Nuss bar procedure. Materials and Methods Four search engines, Google, Yahoo, Ask, and Bing, were used to explore seven key terms concerning PE. Search language was English. The DISCERN quality instrument was used to evaluate the Web sites. Also, information on possible complications was scored per Web site. Results A total of 560 Web sites were assessed in March 2019. Excluded were 139 Web sites. Therewere333duplicates, leaving 88uniqueWeb sites.Of these, 58.1%werehospitalrelated information Web sites, 28.4% medical information Web sites, and 3.4% patient forumsites. Interactivemultimediawas used on 21.6% of the sites. Pain postoperativelywas mentioned on 64.8% of the sites, while only 9.1% mentioned the mortality risk of the surgical correction of PE forNuss bar placement. Thequality of the uniqueWeb sites showed a mean DISCERN score of 42.5 (standard deviation 12.2). Medical information Web sites, encyclopedia, and government-sponsored sites had higher DISCERN scores. Hospitalrelated information sites,medical companies, and lay persons' sites, had lower total scores. Conclusion The overall quality of PE Web sites is low to moderate, with serious shortcomings.