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  1. Seasonal affective disorder (SAD) - Symptoms & causes - Mayo Clinic

  2. How to Deal With Sad Feelings | Psychology Today

  3. Why Am I Sad for No Reason? What Might Be Happening - Healthline

  4. Sad Definition & Meaning - Merriam-Webster

  5. It’s OK to Be Sad: 6 Reasons and How to Manage Sadness - Psych Central

  6. Seasonal affective disorder (SAD) - Diagnosis & treatment - Mayo Clinic

  7. Sadness: Causes, Coping With It, and When to Get Help - Everyday …

  8. Small Ways to Feel Better When You're Depressed - Verywell Mind

  9. Seasonal Affective Disorder - National Institute of Mental

  10. What Is Sadness? And How It Differs From Depression - Verywell …