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Although the viruses that cause laryngitis, such as the common cold virus, are contagious and can be passed from person to person, usually the contagious period for the common cold is earlier on in the infection, before symptoms begin and when the cough and congestion symptoms are at their height.lso mechanical strain (singing or talking) are common non infectious causes of laryngitis. Obviously, mechanical laryngitis is not infectious or contagious. Viral laryngitis, which is the next most common form, is also not usually contagious.
Certain viruses or bacteria can infect the larynx and cause it to swell. Usually, the virus comes from another illness, such as a cold, the flu, or bronchitis. Laryngitis can also occur from using the voice too much (singing or shouting). Chronic laryngitis can be caused by heavy smoking, excessive alcohol use, or acid reflux (gastroesophageal reflux disease or GERD), caused when stomach acid backs up into the esophagus.