Seasonal affective disorder, commonly known as SAD, is a type of depression that affects people in the winter months. Most of us feel energetic and cheerful when the sun is shining and subdued and less active in the winter months. But seasonal affective disorder is more severe than this. Some people are unable to hold down a job in winter because of lethargy, tiredness and poor concentration; relationships often break down because the sufferer becomes irritable and unloving. Some people cannot function at all in winter without treatment.
Between October and April, a growing number of people have symptoms of seasonal affective disorder, and a further 20 percent have a milder version known popularly as the “winter blues.” It can begin at any age but is most common between the ages of 18 and 30. Symptoms disappear in spring, either suddenly (with a bout of hyperactivity) or gradually.
Seasonal affective disorder is caused by lack of light. In winter, there are fewer hours of daylight and the light is much less intense. This can mean that insufficient light gets to a part of the brain called the hypothalamus, which controls the important bodily functions of sleep, appetite, temperature, sex drive, mood and activity. For people with SAD, these functions slow down and become reduced.
People with seasonal affective disorder often have a low immune system in the winter and get regular colds, infections and other illnesses. To be diagnosed with the disorder you must have had three years of winter symptoms, including some of the following:
Bright light treatment helps 85 percent of people diagnosed with seasonal affective disorder. It means spending up to four hours a day exposed to very bright light, or full-spectrum light which mimics natural sunlight and is ten times the intensity of domestic lighting. Light boxes that produce this light can be bought commercially. (Here are the best light therapy lamps on Amazon.)
Another option is antidepressant drugs and supplements. Newer antidepressants, such as Lustral and Prozac, can help people with severe seasonal affective disorder, and can be combined with light treatment.
The medicinal herb St John’s wort (Hypericum perforatum) is now a popular treatment for depression, and may also help people with seasonal affective disorder. It should not be taken with conventional antidepressants.
If you’re living with SAD, it’s best to see your doctor. But here are a few quick tips to help you take control:
Source: Adapted from Family Medical Adviser, Reader’s Digest
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