Here are a few options for a WordPress `post_tag` description, catering to different target audiences:

**Option 1: (Concise & General)**

* **Description:** 關於口內炎 (kou nei yan) 的相關文章，包括成因、症狀、護理方法和治療選擇。 (Articles related to mouth ulcers (stomatitis), including causes, symptoms, care methods, and treatment options.)

**Option 2: (Slightly more detailed and informative)**

* **Description:** 口內炎 (kou nei yan), 也就是口腔潰瘍，是常見的口腔疾病。 本標籤涵蓋了各種口內炎的知識，從單純性口瘡到其他口腔病變，也提供舒緩疼痛和促進癒合的建議。 (Mouth ulcers (stomatitis), a common oral disease. This tag covers various aspects of mouth ulcers, from simple canker sores to other oral lesions, and offers suggestions for pain relief and promoting healing.)

**Option 3: (Focus on user experience – good for SEO)**

* **Description:** 尋找關於口內炎 (kou nei yan) 的實用資訊？ 這裡你可以找到有關口腔潰瘍的深入文章，包括不同的成因、症狀的辨別、如何緩解疼痛和加速康復，以及如何預防口內炎。 (Looking for practical information about mouth ulcers (stomatitis)? Here you’ll find in-depth articles on canker sores, including different causes, symptom identification, how to relieve pain and speed recovery, and how to prevent mouth ulcers.)

**Option 4: (Emphasis on professional/medical advice)**

* **Description:** 口內炎 (kou nei yan) 相關資訊，旨在提供口腔健康知識。文章內容包含口內炎的常見原因、診斷方式、治療方法，以及如何與醫生溝通。 請注意，此處資訊不能取代專業醫療建議。 (Information related to mouth ulcers (stomatitis), intended to provide oral health knowledge. The content includes common causes, diagnostic methods, treatment options, and how to communicate with doctors. Please note that this information does not replace professional medical advice.)

**Explanation of Choices and Considerations:**

* **The Title is the Key:** The title “口內炎” is already clear, so the description’s primary purpose is to clarify what kind of content the user can expect under this tag.
* **Target Audience:** Tailor the description to your audience. The more specific you are about what they’ll find, the better.
* **Keywords:** Use relevant keywords (like “口內炎,” “口瘡,” “口腔潰瘍,” “成因,” “症狀,” “治療,” “護理”) to improve SEO.
* **Conciseness:** Keep it brief and to the point. Most tag descriptions don’t need to be lengthy.
* **Practicality:** Offer useful information for the reader about the content associated with this tag.
* **Tone:** Choose the tone that suits your website’s overall voice. Options range from informative and professional to friendly and approachable.
* **Disclaimer (if applicable):** Include a disclaimer (like in Option 4) if your website provides information but is not a medical professional.

Choose the description that best fits your website and its content. Remember to update this description periodically if your content under this tag changes significantly!