Seasonal Affective Disorder (SAD)
Depression related to seasonal changes, typically worse in winter.
Common Symptoms
- Feeling depressed most of the day
- Loss of interest in activities
- Low energy and fatigue
- Sleep problems (usually oversleeping)
- Changes in appetite (craving carbs)
- Weight gain
- Difficulty concentrating
- Feeling hopeless or worthless
- Social withdrawal
Possible Causes
- Reduced sunlight in fall and winter
- Disruption of circadian rhythm
- Drop in serotonin levels
- Melatonin imbalance
- Living far from equator
- Family history of depression
- Already having depression or bipolar
Note: These are potential causes. A healthcare provider can help determine the specific cause in your case.
Quick Self-Care Tips
- 1Use a light therapy box (10,000 lux)
- 2Get outside during daylight hours
- 3Exercise regularly
- 4Keep a regular sleep schedule
- 5Make environment sunnier (open blinds)
- 6Consider vitamin D supplements
- 7Stay socially connected
- 8Practice stress management
Disclaimer: These are general wellness suggestions, not medical treatment recommendations. They may help manage symptoms but should not replace professional medical care.
When to See a Doctor
Consult a healthcare provider if you experience any of the following:
- Symptoms significantly affect your life
- Sleep and appetite changes are notable
- You feel hopeless or have suicidal thoughts
- You use alcohol or substances to cope
- Home treatments don't help
Talk to a Healthcare Provider
If your symptoms are persistent, severe, or concerning, please consult with a qualified healthcare professional for proper evaluation and personalized advice.
Related Conditions
Chronic Fatigue
Persistent tiredness that doesn't improve with rest and affects daily activities.
Vitamin D Deficiency
Low levels of vitamin D causing fatigue, bone problems, and mood changes.
Insomnia
Difficulty falling asleep, staying asleep, or waking too early.
Depression
A mood disorder causing persistent feelings of sadness and loss of interest.
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Medical Disclaimer
The information on this page is for educational purposes only and is not intended as medical advice. It should not be used for self-diagnosis or self-treatment. Always seek the guidance of a qualified healthcare professional with any questions you have regarding a medical condition. If you are experiencing a medical emergency, call your local emergency services immediately.
Information last reviewed: January 2026
This page provides educational information only. It is not medical advice.