Fibromyalgia flares

A flare is a temporary worsening of fibromyalgia symptoms. It is not only an increase in pain, though that is usually part of it. Fatigue, fibro fog, unrefreshing sleep, and sensory sensitivity often rise together, which is part of what makes a flare so depleting.

During a flare, the things that are difficult on an ordinary day become harder still. Tasks that were manageable the week before may not be possible. The body feels less able to absorb anything extra, whether that is activity, stress, or sensory input.

Flares ease. That is worth holding on to during a bad one. A flare is a worsening of an existing condition, not a permanent step down, and most flares settle back towards your usual baseline given time and reduced load.

Flares do not always announce themselves, but many people notice early signals in the day or two beforehand. Learning your own warning signs gives you a chance to reduce load before the flare takes hold.

Commonly reported early signs include:

• A rise in baseline pain, or pain in areas that are usually quieter
• Heavier than usual fatigue, particularly on waking
• Worsening sleep, or waking less refreshed than normal
• Thicker fibro fog: more word-finding trouble, more difficulty concentrating
• Increased sensitivity to light, sound, or touch
• Feeling unusually irritable, tearful, or on edge

None of these guarantees a flare is coming. But a cluster of them, especially after a known trigger, is often a useful signal to ease back.

Triggers vary widely between people. One person may find cold weather makes little difference but emotional stress is a reliable trigger. Another may be sensitive to a run of bad nights but unaffected by the weather. Identifying your own pattern usually takes several weeks of tracking.

Physical and environmental triggers

• Overexertion. Doing more than usual, whether physical activity, housework, or travel, often leads to a flare, sometimes after a delay of a day or two.
• Poor sleep. A few nights of disrupted sleep can tip symptoms into a flare.
• Weather changes. Cold, damp conditions and sudden shifts in barometric pressure are widely reported triggers, though the evidence is mixed.
• Illness or infection. Even minor infections can trigger significant flares, and can raise baseline symptoms for days or weeks.

Emotional, sensory, and hormonal triggers

• Stress. Emotional stress can trigger flares. So can positive stress, such as a big event or a holiday.
• Sensory overload. Busy, loud, or brightly lit environments contribute to flare build-up, particularly when stacked into one day.
• Hormonal changes. Many people report flares linked to their menstrual cycle, perimenopause, or menopause.
• Diet and dehydration. Some people identify specific food triggers. Dehydration and skipping meals are also common contributors.

There is no way to switch a flare off, but there is a lot you can do to reduce its weight and avoid making it worse.

• Lower the demands on yourself. A flare is the time to drop non-essential tasks, not push through them. Paper plates, pre-prepared food, and a lower standard on housework are reasonable choices, not failures.
• Rest before you are forced to. Build rest in early rather than waiting until you are completely depleted. Rest during a flare is part of the recovery, not a reward for getting through the day.
• Use the tools that already help. Heat, whether a wheat bag, heated throw, or hot water bottle, is among the most widely used supports for flare pain. Gentle warmth, soft clothing, and a quiet, low-light space all reduce the load.
• Protect your sleep. Sleep is often worse during a flare and matters more. Keep the room dark and cool, and lean on whatever wind-down routine usually helps.
• Reduce sensory input. Noise-cancelling headphones, dimmed lights, and fewer competing demands give an overloaded nervous system room to settle.
• Be cautious with movement. Very gentle movement within tolerance helps some people, but a flare is not the time to push. Movement that worsens symptoms is not useful here.

Flares are draining emotionally as well as physically. Feeling frustrated, low, or worn down by a bad stretch is a normal response to it, not a sign of poor coping.

Flares cannot be prevented entirely, but their frequency and severity can often be reduced over time.

Pace consistently. Breaking activity into shorter intervals with rest between, rather than pushing through to completion, is one of the most reliable ways to keep overexertion from tipping into a flare. This matters most on good days, when it is tempting to do too much.

Track your patterns. A brief daily log of activity, sleep, stress, and symptoms, kept over several weeks, is the most reliable way to identify your personal triggers and early warning signs. A simple paper diary works. Tracking apps such as Bearable add more detail if that is helpful.

Address sleep problems. Treating issues such as sleep apnoea and restless legs syndrome can take a real load off an already strained system. See our sleep page for more.

Work with your GP on a baseline plan. Better-controlled pain and sleep between flares tends to reduce how often symptoms tip over the edge.

Most flares can be managed at home and settle with time and reduced load. Some situations warrant medical attention.

Contact your GP if:

• A flare is far more severe or much longer-lasting than your usual pattern
• You have a sudden, severe, or localised pain that does not fit your usual fibromyalgia picture
• There are new symptoms alongside the pain, such as fever, swelling, visible redness, numbness, or loss of function
• Your current management is no longer controlling symptoms that it usually helps

Fibromyalgia does not protect against other conditions developing. A flare that does not fit your normal pattern deserves to be checked, not assumed to be ‘just fibromyalgia’.

Fibromyalgia symptoms: the main symptoms explained in plain language.

Causes and triggers: what causes fibromyalgia to develop, and what triggers day-to-day flares.

Managing fibromyalgia: pain, sleep, gentle movement, and pacing.

The impact of fibromyalgia: how the condition affects work, finances, relationships, and mental health.