Many of the things that you might think you need to see a doctor about can often be dealt with by nurses, all whom have been trained to deal with some medical problems. Indeed, for some things the nurse is more experienced at dealing with the problem than a doctor. Routine blood pressure checks, HRT and contraceptive prescribing, minor illness management and management of diabetes, coronary heart disease, asthma and COPD and many conditions come within their expertise.
The practice nurses also run daily triage clinics. A triage clinic is a clinic for patients who just feel unwell for one reason or another.