将提供的段落改为口语化表达：传统的中医认为病因主要有两大类：内因和外因。内因主要是指人体的七情，如怒、喜、忧、思、恐等，外因则是风、寒、湿、热等自然界的致病因素。
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Traditional Chinese medicine thinks there are mainly two causes of diseases: inside stuff and outside stuff. The inside stuff is mostly about our feelings, like being angry, happy, sad, worried, or scared. The outside stuff comes from nature, like wind, cold, dampness, and heat.
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