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Key Clinical Message: This article emphasizes that patients presenting with COVID‐19 infection especially presenting with predominantly gastrointestinal symptoms and a history of eating disorder or even other mental disorders should be evaluated thoroughly and differential diagnoses should be considered. Clinicians should keep in mind that eating disorders may happen after COVID infection or vaccination. The emergence and global spread of the 2019 novel coronavirus (COVID‐19) have caused a significant mental health burden on communities around the world. Factors related to COVID‐19 affect mental health in the general community, but may have more adverse effects on individuals with pre‐existing mental illnesses. Additionally with the new living conditions and increased focus on hand hygiene and fear of contracting COVID‐19, depression, anxiety, and obsessive–compulsive disorder (OCD) are more likely to be exacerbated. Eating disorders such as anorexia nervosa (AN) have exhibited an alarming increase due to social pressure especially through social media. Also, many patients reported relapses since the commencement of the COVID‐19 pandemic. We report five cases of AN that developed or exacerbated after COVID‐19 infection. Four patients have newly developed (AN) and one case relapsed after COVID‐19 infection. Also, one of the patient's symptoms exacerbated after remission following a COVID‐19 vaccine shot. The patients were managed medical and non‐medically. Three of cases have reported improvements while two other cases were lost because of poor compliance. It might be possible that people with history of eating disorder, or other mental disorders may be more susceptible to newly develop or exacerbate eating disorders after COVID‐19 infection especially when symptoms are gastrointestinal dominant. There is currently minimal evidence on the specific risk of COVID‐19 infection in patients with AN and reporting cases of AN after COVID‐19 infection could help learn the risk, prevent and manage patients. Clinicians should keep in mind that eating disorders may happen after COVID infection or vaccination. [ABSTRACT FROM AUTHOR]