Katharine Hepburn's tremors in On Golden Pond were real. She developed essential tremors, a disease that can affect the extremities by causing them to involuntarily shake in varying degrees. Per a website specializing in health-related information for older adults: "...her tremulous voice and the persistent involuntary movement of her head, ...


Hepburn developed what's known as Essential Tremors http://en.wikipedia.org/wiki/Essential_tremor. It's a neurological disorder that often causes tremors of the hands and arms but can also cause tremors of the head and neck. It is thought to be passed genetically.

Only top voted, non community-wiki answers of a minimum length are eligible