Cute Women's Bikinis & Two Piece Swimsuits Pink Lily Tremulousness, sometimes called internal tremor, vibrations or shaking, has long been recognized as a symptom of elevated sympathetic nervous system tone (a hyperadrnergic state), and it's often seen in POTS. Many people Dysautonomia: Causes, Symptoms and Treatments The Dysautonomia Project Isolated Tongue Tremor Swollen Tongue: Causes, Symptoms, and Treatment