It is also known as laryngeal dystonia. The term spasmodic describes sudden and intermittent jerking movements of muscles and, as such, SD is characterised by poor vocal motor control during speech due to intermittent and involuntary spasms of the laryngeal muscles.
Low iron levels are one of the most common reasons for chronic coldness. Here's why: Iron is a key mineral that helps your red blood cells carry oxygen throughout your body, bringing heat and other nutrients to every cell in your system, explains Dr. Phillips.
Cold temperature can cause symptoms identical to those of Parkinson's Disease including rigidity, loss or lessening of physical movement and tremor, either by being in a cold place, in cold water or by consuming cold drinks. Shivering is simply a cold temperature tremor.