Thriller Sub-Genre's

Thriller, as a genre, has sub-genre's such as action or horror. The sub-genre determines what type of thriller it is, as there is a wide range of thriller's available.

For example, an action thriller can have certain features such as a race against time, violence, fighting and an obvious antagonist. The film would most probably include things such as guns, explosions, car races and other related things. E.g: The Bourne Identity/Supremacy/Ultimatum.
Another example: The Crime thriller sub-genre is a fusion of both crime films and thriller films, and it offers a suspenseful or mysterious account of a crime - successful or failed. This type of thriller usually focus on the criminal-characters, rather than the law enforcers. Crime thrillers are most likely to emphasize the action taking place over the emotional or psychological thoughts/aspects. E.g: The 51st State.
In a Drama thriller, the film would normally consist of "drama" aspects mixed with the thriller aspects. The film is usually more slow paced, and involves the characters developing emotionally, psychologically and sometimes physically. This usually coincides with the plot, and with its twists and turns. E.g: The Interpreter.
Psychological thriller, a normal conflict between main characters leading to an often violent resolution, is another sub-genre. The conflict between the characters is usually mental and emotional, rather than physical. The conflict could even be something that in real life, wouldn't be scientifically possible. This can include movies to the likes of and including "The Ring".
A sub genre of both thriller and spy fiction, is Spy Thriller. This usually involves a hero, who has some relationship with the government or is a government agent. The hero is needed to take violent action against a rival government or terrorists, though the latter is more of a recent making. E.g: Bourne Trilogy and Mission: Impossible.
Supernatural thriller, another sub genre, includes conflicts between some main characters. Usually one, both or all of them has super-powers, and may be considered a SuperHero or a Villain. E.g: Unbreakable.
A Medical thriller is a thriller with the hero/heroine as a doctor or a medical personnel. They work to solve a problem, the majority of which medical, or are sparked by a medical problem. Films such as "Awake" can be an example of a medical thriller, and "Diagnosis Murder" is an example of a TV medical thriller. Nonfiction medical thrillers can also be a subcategory, comprising things like "The Hot Zone".
The Legal thriller is a sub genre film type, in which the hero/heroine is a legal figure, like a lawyer. They usually have to deal with and confront enemies outside, as well as inside, the courtroom, and are in danger of losing the cases or what they are fighting for, or even their lives. E.g: The Innocent Man.