Here are a few descriptions for a WordPress post_tag titled “體重過輕” (Tǐzhòng guòqīng – Underweight) in Traditional Chinese, ranging in formality and tone, to suit different audiences:

**1. Concise & Informative:**

> 體重過輕相關的文章分類。 包含體重過輕的定義、原因、風險、影響，以及改善和健康增重的建議。

> *Translation:* Articles categorized under “Underweight.” Includes definitions, causes, risks, impacts, and suggestions for improvement and healthy weight gain.

**2. More Detailed & Encouraging:**

> 所有關於體重過輕的資訊，都在這裡。 了解體重過輕的成因，以及它可能造成的健康風險。 我們也提供安全的增重方法，幫助你達到健康的體重範圍，促進整體健康。 讓我們一起來關心自己的健康，克服體重過輕的挑戰！

> *Translation:* All information about underweight is here. Understand the causes of underweight and the health risks it may pose. We also offer safe weight gain methods to help you achieve a healthy weight range and improve overall health. Let’s care about our health together and overcome the challenges of being underweight!

**3. Focusing on the Audience’s Needs:**

> 想知道自己是否體重過輕？ 不知道如何安全地增加體重？ 這個標籤包含了關於體重過輕的一切，包括如何判斷、可能造成的影響，以及實用的、循序漸進的增重方法。 幫助你擺脫體重困擾，重拾健康自信！

> *Translation:* Wondering if you’re underweight? Don’t know how to gain weight safely? This tag contains everything about being underweight, including how to assess it, potential impacts, and practical, step-by-step weight gain methods. Helping you overcome weight-related concerns and regain healthy confidence!

**4. Simple & Direct:**

> 關於「體重過輕」的所有文章。 了解原因、風險，以及如何健康增重。

> *Translation:* All articles about “Underweight.” Learn about the causes, risks, and how to gain weight healthily.

**Choosing the best description depends on:**

* **Your Website’s Tone/Branding:** Is your site formal, friendly, informative, or something else?
* **Your Target Audience:** Who are you trying to reach?
* **The Content of Your Articles:** The description should accurately reflect the types of articles tagged with “體重過輕”.

I recommend choosing the one that best fits your overall goals! Good luck!