An attack is usually temporary, so the doctor relies on the patient's description to diagnose the problem. If the problem is caused by another disease or risk factor, the patient is said to have secondary Raynaud's phenomenon. Primary Raynaud's usually affects both hands and both feet, and the cause is not known for certain. Secondary Raynaud's usually affects either both hands or both feet. Causes of secondary Raynaud's can be identified.
Smoking is one cause.
Some drugs may also cause this form of Raynaud's phenomenon. Migraine headache medications. Injuries may also cause Raynaud's phenomenon. They can result from frostbite, surgery, or other causes. For example, regular use of machinery such as chain saws and vibrating drills can hurt blood vessels.