WINTER BLUES

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The gloom of winter seems to get inside some people, the dark affecting their moods as well as their days. Known as seasonal affective disorder (SAD), this form of depression affects about 1% to 2% of the population. Although it strikes all genders and ages, women are more likely to develop SAD than men, and young people are more likely to develop it than older people.

SAD seems to be triggered by decreased exposure to daylight. Typically, it arrives during the fall or winter months and subsides in the spring. Symptoms are similar to general depression and include lethargy, loss of interest in once-pleasurable activities, interpersonal problems, irritability, inability to concentrate, and changes in sleeping patterns, appetite, or both.

Experts don’t fully understand the cause of SAD, but leading theories place the blame on an out-of-sync body clock or on improper levels of either the hormone melatonin or the neurotransmitter serotonin.

The mainstay of SAD treatment is light therapy, also called phototherapy. Phototherapy involves daily sessions of sitting close to a special light source that is far more intense than normal indoor light. The recommendation is typically to get 30 minutes of exposure to light at an intensity of 10,000 lux each day, but optimum dosing remains a major question. Some people need more light exposure than this, others need less.

The light must enter through the eyes to be effective; skin exposure doesn't seem to work. Some people feel better after only one light treatment, but most people require at least a few days of treatment, and some need several weeks. You do not need a prescription to purchase a light box to treat SAD; however it’s best to work with a professional to monitor the benefits of the treatment.

Some SAD light boxes look like medical equipment, while others are more like regular table lamps. The prices vary. Although professional groups and government agencies endorse light therapy, your insurance company may balk. If you are counting on coverage, better check first.

Living through the physical and emotional toll of breast cancer is so traumatic that some women can't bear the thought of doing it again. That's why a growing number of women who have already been diagnosed with cancer in one breast are taking the drastic measure of having both breasts removed. Read more.

Confirming depression — when extra tests might help Medical science is making good progress in unraveling the biological underpinnings of depression. Someday, these discoveries may lead to lab tests that can help identify or confirm depression and other mood disorders.

Right now, doctors and therapists rely mainly on the symptoms reported by their patients to diagnose depression and determine a course of treatment.

Sometimes, though, additional information can help distinguish depression from other problems. That’s why your doctor might recommend any of the following tests:
• Psychological tests, during which you answer questions, respond to pictures, or perform tasks like sorting cards or drawing pictures. These tests can give your doctor a better sense of your coping mechanisms, your temperament, or your ability to organize and plan.

• Tests that look at the brain, such as an EEG or MRI, which can help identify causes of dementia or some rare causes of depression. Both tests are painless. During an EEG, electrodes taped to your scalp pick up electrical signals. An MRI uses magnets, a radio wave transmitter, and a computer to pick up small changes in energy in hydrogen molecules in your brain and process the data to make a detailed scan of your brain.

• Other tests, such as a blood test to check thyroid function, may also be helpful.

www.health.harvard.edu

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