Because CRPS can be difficult to diagnose, your doctor may refer you to a neurologist, rheumatologist, or pain specialist. These specialists have the knowledge needed to properly diagnose and treat this condition. Your doctor will first try to find out what causes your pain by asking questions about how your symptoms are affecting your daily life and making sure that you don't have any other problems that could be causing your pain. He or she may also do some tests to help determine the source of your pain. For example, your doctor may ask you to stand with your legs straight for several minutes while watching how long it takes your leg to go numb. This test is called the "10-minute foot test" and helps determine if there is damage to the nerves in your legs from prolonged standing or walking. If your doctor cannot find an underlying cause for your pain, he or she may refer you to a neurologist for further evaluation and treatment. A neurologist has special training in diagnosing conditions related to the brain and nervous system such as CRPS. Your doctor may also refer you to a rheumatologist for evaluation if you have joint pain along with your nerve pain.