Constantly thinking and talking about problems can cause them to grow, as rumination is a key symptom of depression. Engaging in activities like exercise or running errands, instead of dwelling on problems, is beneficial for mental health. Therapists who effectively address depression aim to break the habit of rumination, as indulging in this behavior is a luxury afforded by a relatively safe and comfortable life, unlike those in challenging circumstances who cannot afford to spend time obsessing over problems.