Symptoms|Treatments|Side effects|Causes
| cause | % of members (num votes) |
|---|---|
| Time of year: fall, winter |
96% (84)
|
| Weather |
84% (82)
|
| Sharply reduced sunlight |
83% (41)
|
| Genetics |
52% (62)
|
| Vitamin D deficiency |
49% (68)
|
| Latitude |
54% (54)
|
| Holiday season |
22% (59)
|
| Summer, high temperatures |
12% (77)
|