Diseases are classified into categories. It is sometimes appropriate to classify a disease into more than one category.

1. Indicate which of the following diseases fit into the categories infectious, deficiency and degenerative.

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   1. cholera

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   2. night blindness

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   3. lung cancer

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   4. stroke

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   1. State one example of an inherited disease.

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   2. Explain why the disease you name is classified as an inherited disease.

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   Some diseases are classified as self-inflicted diseases. Smoking is considered by the World Health Organisation to be a self-inflicted disease of epidemic proportions.

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3. State what is meant by a self-inflicted disease.

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4. Suggest why the World Health Organisation considers smoking to be a disease of epidemic proportions.

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