Here’s a description for the WordPress post_tag “常見疾病” (Common Diseases) in Traditional Chinese, considering its purpose is to categorize blog posts:

**Description:**

涵蓋一系列常見疾病的資訊，包括病因、症狀、診斷、治療方案及預防措施。 此標籤適用於分享有關感冒、流感、高血壓、糖尿病等普遍存在疾病的文章，旨在提供讀者健康知識，促進早期發現與預防，以及理解不同疾病的相關知識。

**Translation & Explanation of Chosen Words:**

* **涵蓋一系列常見疾病的資訊 (Hán gài yī xì liè cháng jiàn jí bìng de zī xùn):** Covers information on a series of common diseases. Clear and concise.
* **包括 (bāo kuò):** “Including.” Used to introduce the types of information.
* **病因 (bìng yīn):** Causes of the diseases.
* **症狀 (zhèng zhuàng):** Symptoms.
* **診斷 (zhěn duàn):** Diagnosis.
* **治療方案 (zhì liáo fāng àn):** Treatment plans.
* **及 (jí):** “And.” (Formal and concise)
* **預防措施 (yù fáng cuò shī):** Preventive measures.
* **此標籤適用於 (Cǐ biāo qiān shì yòng yú):** This tag is suitable for… (Direct and informative)
* **分享有關 (fēn xiǎng yǒu guān):** Sharing information about…
* **感冒 (gǎn mào):** Common Cold
* **流感 (liú gǎn):** Influenza (Flu)
* **高血壓 (gāo xuè yā):** High Blood Pressure
* **糖尿病 (táng niào bìng):** Diabetes
* **等 (děng):** “And similar,” or “etc.”
* **普遍存在疾病的文章 (pǔ biàn cún zài jí bìng de wén zhāng):** Articles about commonly occurring diseases.
* **旨在提供 (zhǐ zài tí gōng):** Aims to provide… (Indicates the purpose).
* **讀者健康知識 (dú zhě jiàn kāng zhī shi):** Health knowledge for readers.
* **促進早期發現與預防 (cù jìn zǎo qī fā xiàn yǔ yù fáng):** Promote early detection and prevention.
* **以及理解不同疾病的相關知識 (yǐ jí lǐ jiě bù tóng jí bìng de xiāng guān zhī shi):** As well as understanding relevant knowledge about different diseases.

**Rationale:**

* **Comprehensive:** The description covers what the tag aims to include (information about various aspects of common diseases), and what type of articles will be categorized under this tag.
* **Informative:** Clear and descriptive.
* **Targeted:** Speaks directly to the purpose of the tag in the context of a blog meant to provide health information.
* **Formal yet Accessible:** Uses appropriate professional language while remaining easy to understand.
* **SEO-Friendly:** Includes relevant keyword phrases like “病因,” “症狀,” “治療,” and encourages readers in the prevention of the disease.

This description effectively communicates the function and scope of the “常見疾病” tag within your WordPress blog. You can copy and paste this directly into the description field when editing the tag in your WordPress admin panel. If you have additional related terms, like the name of a disease, you can use the tag field in the post editor, and WordPress will automatically recognize it in the search results.