Until now, Spanish 'como' with subjunctive has never been researched empirically. The existing papers use minimal pairs comparing causal phrases with como with indicative and conditional phrases with 'como' with subjunctive, but not as a research base but in order to give examples for their theories. Frequently, 'como' is not even the main object of research in those works, but is only used to explain the differences between the moods. The scientists sustain that by using 'como' with subjunctive, the speakers don't take the responsibility that the facts by them announced are truth, they leave it up to their future incidence. Therefore, a cause in 'Como me pagan me voy de vacaciones', which due to the use of indicative expresses cause because the speakers confirm its truth, converts into a hypothetical cause as the speakers do not confirm its truth, but its possible incidence by using subjunctive. The event of a hypothetical cause is insecure, converting it into a condition. However, Spanish 'como' has the specific feature to be able to establish not only conditional relations with subjunctive, but causal ones as well, depending on the content. The main objective of this paper is to give information about the existing theories regarding como with subjunctive, and then to do detailed research concerning the use of conditional 'como' using a database with examples from the online corpus www.corpusdelespanol.org. At first, the examples are separated concerning their conditional or causal meaning and then the conditional ones are examined in a detailed way in order to verify a hypothesis about the main characteristics that determine the use of this construction, such as the expression of threats, spoken language, a minimal condition or emphasis. An own short chapter will be dedicated to the causal use of 'como' with subjunctive.