Here are a few options for the WordPress post_tag description, catering to different needs:

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

> 嗅覺障礙指聞不到氣味，或聞到的氣味與實際不同。包括失嗅症、嗅覺減退及異嗅症等。

*(Smell disorder refers to not being able to smell, or smelling different scents from reality. Includes anosmia, hyposmia, and parosmia.)*

* **Good for:** General use, provides a brief and accurate overview.

**Option 2 (Slightly More Elaborate):**

> 了解嗅覺障礙。本標籤涵蓋與嗅覺相關的各種問題，例如：失去嗅覺 (失嗅症)，嗅覺變弱 (嗅覺減退)，以及聞到異常氣味(異嗅症) 等。希望對您有所幫助。

*(Understanding Smell Disorders. This tag covers various issues related to the sense of smell, such as loss of smell (anosmia), weakened sense of smell (hyposmia), and smelling unusual odors (parosmia). Hope this helps you.)*

* **Good for:** Users searching for more information, clarifies the scope of the tag.

**Option 3 (Focus on Symptoms and Causes):**

> 探討嗅覺障礙及其成因。失嗅症、嗅覺減退、異嗅症的症狀，以及引起這些症狀的疾病，如鼻竇炎、鼻息肉、病毒感染甚至神經系統疾病。

*(Exploring Smell Disorders and their causes. Symptoms of anosmia, hyposmia, parosmia, and diseases that cause these symptoms, such as sinusitis, nasal polyps, viral infections, and even neurological diseases.)*

* **Good for:** Posts focused on symptoms, causes, or diagnosis of smell disorders.

**Option 4 (For a Medical/Technical Blog):**

> 嗅覺障礙 (Olfactory Dysfunction) 的研究與資訊。本標籤涵蓋有關失嗅、嗅覺倒錯、變形嗅覺等感知異常的學術文章、病例報告及臨床研究，以及相關的診斷和治療方法。

*(Research and information on smell disorders (Olfactory Dysfunction). This tag covers academic articles, case reports, and clinical studies related to olfactory perception abnormalities such as anosmia, parosmia, and phantosmia, as well as related diagnosis and treatment methods.)*

* **Good for:** Blogs with a medical or scientific focus; uses more technical terms.

**Key Considerations:**

* **Your Target Audience:** Who are you writing for? Are they patients, medical professionals, or a general audience? This will influence the level of detail and the language you use.
* **Content of Your Posts:** Does your content focus on symptoms, causes, treatments, personal stories, or a combination? Your description should reflect your content.
* **Keywords:** When writing your description, consider using relevant keywords that people might search for (e.g., 失嗅症, 嗅覺減退, 鼻竇炎).

**Recommendation:**

Choose the option that best aligns with the overall tone and purpose of your blog/website. I generally recommend **Option 2** for a straightforward and easily understandable description for most WordPress blogs. However, modify it to suit your specific content. You can always adjust it later if needed!