Plantar fasciitis is a common cause of heel pain in adults. It is an overuse injury typically caused by repetitive strain, such as standing or walking for extended periods that you are not normally used to. Please see below for more information:

https://www.sgh.com.sg/content/dam/singhealth-web/sgh/imported-assets/assets/patient-care/specialties-services/physiotherapy/publishingimages/pages/patient-resources/Heel%20Pain%20(Jan%202021).pdf