Seasonal Affective Disorder (SAD) and Chronic Illness

When winter weighs a little heavier

Many people notice their mood, motivation and energy dip as autumn turns to winter. For some, this is seasonal affective disorder, often called SAD. When you already live with a chronic illness, it can be hard to tell what is the season, what is your condition, and what is simply being worn down. All of it is real, and none of it is a personal failing.

Common signs of SAD

• A low or flat mood that returns around the same time each year
• Losing interest in things you usually enjoy
• Feeling more tired, sleeping longer, or finding it hard to wake
• Craving carbohydrates or comfort food
• Feeling irritable, tearful or withdrawn

Why it can overlap with chronic illness

Fatigue, poor sleep and low energy are shared by SAD and many long-term conditions, including ME/CFS, fibromyalgia, Long Covid, hypermobility and PoTS. Less daylight can unsettle your body clock, cold weather can increase pain, and staying in more can mean less connection. These changes can feed into each other, which is part of the October slide many people feel.

A helpful clue is pattern. If your mood dips in a similar way every autumn and lifts in spring, separate from your usual flares, it is worth mentioning to your GP.

Gentle, energy-aware ways to help

• Let the light in early. Open curtains as soon as you wake and sit near a bright window in the morning. A short trip outside on a better day counts too.
• Consider a SAD lamp. Light therapy helps many people. Check with your GP or specialist first, especially with eye conditions, migraines or light-sensitive medication.
• Keep a steady wake time. A regular morning anchor can help your body clock more than an early bedtime. See managing sleep in winter.
• Plan small pleasures. A warm drink, a favourite playlist or a phone call with a friend. Small things are easier to keep going than big plans.
• Pace kindly. Lower energy is not laziness. Use spoon theory to plan lighter days.
• Stay gently connected. Low mood often pulls us inward. Low-pressure company, even camera off, can help you feel less alone.

Is it SAD or a winter flare?

These are gentle clues, not a diagnosis. Many people have both at once.

• More like SAD: low or flat mood, losing interest in things you enjoy, sleeping longer but waking heavy, craving carbohydrates, and a pattern that returns each autumn and lifts in spring.
• More like a flare or crash: more pain or stiffness in the cold, flu-like exhaustion a day or two after doing more, or symptoms that ease with rest. See why you crash after a good day.

Using a SAD lamp when you have a chronic illness

Most SAD advice says to sit in front of a bright light box each morning. If you live with migraines, PoTS, ME/CFS or sensory sensitivities, that bright light can feel like too much. Always check with your GP or specialist first, then these ideas may make it gentler:

• Start small. Try 10 to 15 minutes and build up slowly over a week or two if it feels okay.
• Place it to the side. The lamp works from an angle, so you do not need to look straight at it. This can be easier on sensitive eyes.
• Use it lying or sitting down. If standing makes PoTS symptoms worse, use the lamp while resting with breakfast or a warm drink.
• Try a dawn simulator. A light that slowly brightens before you wake can be a softer option if bright light boxes trigger headaches.
• Mornings only. Using bright light late in the day can make it harder to sleep.
• Stop if it doesn't suit you. If you notice headaches, a racing heart, feeling wired or eye strain, stop and talk to your GP.

Relaxation for low winter days

Guided relaxation will not cure SAD, but it can soften tension, quieten a busy mind and give you a calm half hour that asks nothing of you. Past relaxations are available on demand with a free account, so you can listen whenever you need to, with no payment details needed. You can also read about low mood and grief with chronic illness.

When to get support

Speak to your GP if low mood lasts more than two weeks, stops you doing everyday things, or returns each winter. Treatments such as talking therapy, light therapy and medication can help. If you feel very low or unsafe, call Samaritans on 116 123 at any time, or 999 in an emergency.