The entire intervention is composed by four 30 minutes sessions along 1 week. Its focus is on the promotion of well-being by the use of two virtual environments ("Emotional Parks" and "Walk through Nature"). These environments allow participants to involve in different exercises (working with self statements, videos, images, slow breathing, focus on the present exercises) with the purpose of increase positive emotional states.

Participants receive the medical treatment deliver by the hospital. They fulfill several questionnaires at two moments (pre and post 1 week after). After this, they have the possibility to receive the psychological intervention.

Participants receive two sessions oriented to joy and two focused on relax. In the first 2 sessions patients can choose the environment ("Emotional Parks" or "Walk through Nature") and in the following ones participants visit the alternate environments.

Subjective mood change after each intervention session.

Assessment of general mood, joy, sadness, anxiety, relax and vigor (7-point Likert scale)

This instrument has 9 items aimed to evaluate the cognitive and emotional representation of the illness (consequences, timeline, personal control, treatment control, identity, concern, emotional response, illness coherence and causes).