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Acid reflux is the most common cause of chronic laryngitis. But chronic laryngitis may be caused by more severe problems such as nerve damage, sores, polyps, cancer, or hard and thick lumps (nodules) on your vocal cords. The vocal cords are the vibrating elastic bands inside the larynx that produce your voice.
Quick Answer. Long-term exposure to irritants, cigarette smoking and acid reflux are among the factors that can cause chronic laryngitis, according to Mayo Clinic. Excessive hoarseness or voice loss can also occur in singers who overuse their vocal cords or individuals with chronic sinus problems. Keep Learning.