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.
Similar to how the body reacts to heat during the summer months, the body naturally reacts and attempts to acclimate itself to cold. The most important factor in effectively battling and surviving in the cold is the body's ability to maintain its internal core temperature around 98.6 degrees Fahrenheit.