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To diagnose Raynaud's, your doctor will ask you questions about your symptoms and do a physical exam. You'll need to describe what happens during an attack. If you can take a photo of the affected area during an attack, the photo may also be helpful to your doctor.
There are no tests that can show that you have Raynaud's. But your doctor may do a blood test or other tests to rule out diseases that may be causing your symptoms.