Which theory has the purpose "to improve understanding of symptoms experienced in various contexts and to provide information useful for designing effective means to prevent, ameliorate, or manage unpleasant symptoms and their negative effects" ?

Question

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The Theory of Unpleasant Symptoms focuses on understanding the symptoms experienced in various contexts, aiming to provide insights that can help in preventing, alleviating, or managing unpleasant symptoms and their adverse effects.

Which Theory Has the Purpose "To Improve Understanding of Symptoms