Medical experts have not yet decided if these conditions are hereditary.
More research is needed.
This does not mean hereditary does not or can not trigger or influence these conditions, just that medical experts do not agree if or how much heredity plays in their development. If you suspect one of these conditions may affect someone in your family you should consult your family physician to learn more. This list is not complete. Environmental conditions may also play a part. Personality and behavior changes are to be expected as the disease progresses.