The exact cause of Raynaud's is unknown. One theory links blood disorders characterized by increased platelets or red blood cells that may increase the blood thickness. Another theory involves the special receptors in the blood that control the constriction of the blood vessels are shown to be more sensitive in individuals with Raynaud's. A risk factor is anything that may increase a person's chance of developing a disease. It may be an activity, such as smoking, diet, family history, or many other things.
Different diseases have different risk factors.
Although these factors can increase a person's risk, they do not necessarily cause the disease. Some people with one or more risk factors never develop a disease, while others develop the disease and have no known risk factors. But, knowing your risk factors to any disease can help to guide you into the appropriate actions, including changing behaviors and being clinically monitored for the disease. There are certain diseases or lifestyle choices that can increase a person's risk for developing Raynaud's. The following are the most common symptoms of Raynaud's phenomenon.