Raynaud's disease is a condition that affects blood flow to the extremities which include the fingers, toes, nose and ears. It was named after Maurice Raynaud, a French physician who first described it in 1862. Raynaud's may be secondary to systemic lupus erythematosus (SLE).

Patients with Raynaud's have fingertips that, in the cold, are painful and undergo a colour change from white (pale) to blue to red.