Laryngitis is an inflammation of the mucous membranes
of the larynx. Signs of laryngitis include hoarseness and loss of voice. The
most common causes are excessive meowing and a chronic cough. Both cause vocal
Laryngitis can be associated with tonsillitis, throat infections,
tracheobronchitis, pneumonia, inhalant allergies, and (rarely) tumors in the throat. The lining of the larynx is not
coated with cilia. Therefore, mucus frequently accumulates in the larynx.
Exaggerated throat clearing is needed to dislodge it. This further irritates
the larynx and lowers resistance to infection.
Hyperthyroidism in cats is almost always associated with a cancer-a benign adenoma (more
common) or a malignant adenocarcinoma. These cancers tend to occur in older
cats and the major effect is the increased thyroid hormone production they
stimulate. Exposure to secondhand cigarette smoke may be a factor. Himalayans
and Siamese have a lower risk for this problem.
The first signs may be dramatic. The increase in thyroid hormones tends to
cause an increase in appetite-the finicky eater now...
Treatment: Laryngitis due to excessive meowing usually responds to removing
the cause of the cat’s anxiety or distress. If the problem is due to
prolonged coughing, seek veterinary
attention to investigate and eliminate the cause of the chronic cough.
WebMD Veterinary Reference from "Cat Owner's Home Veterinary Handbook"