The most definitive method of diagnosing a yeast infection is through a yeast infection test. This requires a visit to your doctor or health care provider. On visiting the doctor, you will be asked about the symptoms, the length of time you’ve had these symptoms and possibly any medications you are taking. Your honesty in answering these questions is critical, particularly if this is not the first time you’ve had this problem. If you’ve had this before, it is very possible you can have it again.