While walk-in clinics treat most minor injuries and illnesses, it is generally not a good idea to substitute them for a primary care physician. These facilities exist to supplement, not replace, primary care providers which may be closed in the evenings or on weekends and holidays. Using a walk-in clinic as your primary care provider may limit your access to healthcare due to the lower capacity of these facilities compared to a regular medical facility. Additionally, you may have trouble seeing the same provider visit to visit, so they may have very little awareness of your medical needs on an on-going basis.