| Name : | A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # All |
| Name | Description |
| Darnay's Disease [1] | A disease which attacks the which attacks the central nervous system and the brain. Symptoms include pain, coughing, shortness of breath, irritability, and erratic behavior. In the final stages health is so damaged that use of a transporter can be fatal. The condition was incurable with the medicine available to the Federation as of 2365. |
| Dermal Dysplasia [2] | Skin disease caused by over-exposure of the epidermis to thermal and ultraviolet radiation. [2] |
| Dorek Syndrome [3] | A rare and incurable disease which affects 1 in 5 million Ferengi. Quark was once told he had Dorek Syndrome, but this was a lie. [3] |
| Name : | A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # All |
| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | TNG | 2 | The Schizoid Man | |
| 2 | VOY | 3 | Future's End, Part 1 | |
| 3 | DS9 | 4 | Body Parts |
| Series : | TNG Season 2 |
| Episode : | The Schizoid Man |
| Series : | VOY Season 3 |
| Episode : | Future's End, Part 1 |
| Series : | DS9 Season 4 |
| Episode : | Body Parts |
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