It is important for cancer survivors to see a doctor for regular medical check-ups following treatment. Check-ups typically occur every 3-4 months for several years after treatment, and then once or twice per year after that. At a follow-up appointment, a doctor may look for side effects from treatment and to see if the cancer has returned or spread to other parts of the body. In some cases, blood tests, imaging scans (CT, MRI, PET, etc.) or other tests will be performed.