A doctor will take a full history from the person, asking about any previous penis infection or injuries they might have had. They may also inquire about the impact of any symptoms on sexual activity. A physical examination will include them looking at the penis and foreskin.
The doctor may order urine tests to check for urine infections or take a swab from the foreskin area to check for bacteria.
Phimosis is a risk factor for type 2 diabetes. Adults presenting with a tight foreskin may be given blood and urine tests to check their blood sugar levels, as a result.