Walk-In Doctors Everything You Need To Know Walk-in clinics are a convenient, affordable option for people who don't have a regular doctor or who don't want to wait for an appointment. They offer a variety of services, from treating minor illnesses and injuries to providing physicals and drug screenings. Walk-in clinics can be found in grocery stores, pharmacies, and other retail locations. The staff at walk-in clinics is often nurses or nurse practitioners and can provide you with treatment for most minor illnesses and injuries.