Environmental Health — Kindle Category Opportunity
Competition snapshot for the Medical eBooks best-seller list, ease-of-entry score 66.0/100.
Category metrics
Score
66.0
Median reviews
12.5
Weak share (top 20)
70%
Median price
$9.99
Median star rating
4.6
Books scanned
50
Worth writing in?
Environmental Health reads as low-competition at first glance, but the full list shows thin reader activity — the median book has just 12.5 reviews. Weak incumbents here usually mean weak demand, not an open door. Ease-of-entry score 66.0/100.
Breakout books — top 15, under 100 reviews, $0.99–4.99
Best-seller list on Amazon| # | Title | Star | Reviews | Price |
|---|---|---|---|---|
| 12 | This City Is Killing Me: Community Trauma and Toxic Stress in Urban America | 4.6 | 66 | $2.99 |
High-frequency phrases in this category's titles
Mine all categoriesHigh-frequency phrases mined from the 50 best-seller titles on this category's list. The ease-of-entry score tells you how winnable the category is; these title phrases tell you which words readers search with — use the two layers together. Frequency is a title statistic, not a search-volume estimate.
| Phrase | Titles | Rank-weighted score |
|---|---|---|
| reclaim your health | 2 | 94 |
| lyme disease | 2 | 74 |
| study guide | 2 | 69 |
| infection control | 2 | 63 |
| self assembling nanotechnology | 2 | 49 |
| healing handbook | 2 | 31 |
| public health | 2 | 28 |
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Category research picks the direction; review diagnosis reads the readers. The same platform clusters a book's critical reviews into severity-ranked root causes, each anchored to verbatim quotes — see it applied to a full narrative-history title.
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Research snapshot scanned on Oct 19, 2026. Refreshed periodically — not live tracking.