Objectives:
The aim of this paper is a presentation of the adaptation process of the Cyberchondria Severity Scale (SCC) to measure cyberchondria and verification of reliability and construct validities of the test in the Polish population.

Methods:
The study included 380 participants (203 women and 177 men) aged 19–68 (M = 26.5; SD = 11.1). The CSS-PL was used to measure cyberchondria, the Short Health Anxiety Inventory (SHAI) for measuring hypochondria, and the Dimensional Obsessive-Compulsive Scale (DOCS) to verify obsessive-compulsive tendencies.

Results:
Four-factor structure of cyberchondria measured with the CSS-PL was supported. Internal consistency indices of the CSS-PL were between 0.87 and 0.95, test-retest reliability results were 0.58–0.76. This study demonstrated construct validity of the CSS-PL via its correlations with health anxiety (r = 0.31–0.56) and obsessive-compulsive symptoms (r = 0.17–0.48).

Conclusions:
The CSS-PL is an initial standardized version of an instrument for measuring cyberchondria and meets the psychometric criteria of reliability and validity for psychological testing tools. The CSS-PL may be used both in diagnostic and scientific research.