Short answer: fatigue and poor sleep in rheumatoid arthritis rarely have one cause
Fatigue and poor sleep with rheumatoid arthritis usually have more than one cause, and they can be separated one at a time. The main candidates are active inflammation, anaemia, a sleep disorder such as sleep apnoea or restless legs, low mood, a medicine side effect and an underactive thyroid [1][6][7][8][9][10][14][15][16][17]. Record your symptoms and sleep, then ask your doctor to check each cause in turn rather than treating tiredness as one thing.
Some steps have good evidence and some have weak evidence, and we say which is which as we go [2]. This article does not replace your doctor's advice, and any change to a medicine is a decision for the prescriber alone.
Six possible causes of fatigue and what is known about each
Fatigue is a very common complaint with rheumatoid arthritis. A systematic review of 25 studies found the strongest evidence of a link with pain, physical functioning and depression, while the link with inflammatory activity itself was unclear [1]. So you can be exhausted while the joints are quiet, and the reverse can also happen.
Sleep is a large part of the picture. In a study of 95 patients, 57% had non-optimal sleep, and it was linked with pain and disability [4]. A review of studies in the Eastern Mediterranean region (six studies, 2,315 patients) estimated sleep problems at 60.9% (95% CI 56.5 to 65.2%) [12]. A smaller study of 48 patients found that how people felt about their sleep tracked with fatigue (a correlation of about -0.5), while movement-tracker measurements did not [13]. The takeaway: how you feel about your sleep matters, even when a device sees no difference.
The six causes we separate below: • Disease activity and pain. • Anaemia. • Sleep disorders (sleep apnoea, restless legs, insomnia). • Mood (depression and anxiety). • Medicines. • The thyroid.
How do I know whether my rheumatoid arthritis is active?
The signs that point to active disease are joint pain, swelling and stiffness, with the stiffness usually worse in the morning or after a period of inactivity [17]. General symptoms can come with them: tiredness and lack of energy, a high temperature, sweating, poor appetite and weight loss [17]. Symptoms can come and go, and the periods when they worsen are called flares [17].
At home you can record how many minutes morning stiffness lasts, how many joints are swollen or tender, and how many times pain woke you at night. Those numbers help your doctor.
The final judgement belongs to the doctor, who examines the joints, orders blood tests, and may measure a disease activity score regularly to decide on the right treatment [21]. Note that fatigue alone is not a reliable sign of activity, because the relationship is unclear [1]. In studies, thyroid dysfunction and sleep apnoea were not linked to disease activity [7][9]. So if you are exhausted while your joints are calm, that is a good reason to look for another cause.
Read also: Rheumatism blood tests explained · Rheumatoid arthritis treatment options and monitoring
Anaemia and the thyroid: two causes found with a blood test
Anaemia: a systematic review found mild anaemia in 33 to 60% of people with rheumatoid arthritis, linked with more severe joint disease, and correcting it was linked with better energy [6]. Paleness with tiredness and breathlessness are signs worth reporting to your doctor, especially if you take methotrexate [16]. A full blood count and an iron-store test can detect it, and the doctor decides the cause and the treatment.
Thyroid: a study of 58 women with rheumatoid arthritis found thyroid dysfunction in 19%, of whom 17% had an underactive thyroid, with no link to disease activity [9]. The sample is small, so treat the figure as a signal, not a verdict. Underactive thyroid symptoms include extreme tiredness, feeling cold more than usual, weight gain, constipation, difficulty concentrating and low mood [20].
The practical point: both are checked with simple, widely available blood tests, and if either is present your tiredness has an explanation that can be treated. The basic tests for persistent fatigue are laid out in the linked article below.
Read also: Constant fatigue: which tests to start with
Sleep disorders: sleep apnoea, restless legs and insomnia
Sleep apnoea: in a study of 199 people with rheumatoid arthritis, about 55% had an overnight sleep study, and the researchers estimated sleep apnoea in 58.1%, moderate to severe in 22.9%, with no relationship to disease activity [7]. Signs include loud snoring, gasping or choking noises, waking a lot, heavy daytime tiredness and a morning headache [18]. If someone has seen you sleep, ask them to describe it to your doctor. Diagnosis is by a sleep study, treatment depends on severity, and many people need a device that keeps the airway open with air pressure [18].
Restless legs: a strong urge to move your legs, worse at rest and at night, which ruins sleep [19]. A pooled analysis found it in 26.6% of people with rheumatoid arthritis (95% CI 18.6 to 34.6%) [8]. Describe it in detail to your doctor: when it starts and whether moving eases it.
Insomnia: a 2025 review of sleep disorders in rheumatoid arthritis lists depression, anxiety, obesity, dyslipidaemia and cardiovascular disease as risk factors [5]. In a randomised trial of 62 patients, a 6-week group programme of cognitive behavioural therapy for insomnia improved the outcomes patients reported, but the objective sleep-lab measure straight after the programme did not reach significance (sleep efficiency 88.7% versus 83.7%, P = 0.068) [11]. So the benefit is plausible, but the evidence is not conclusive.
Read also: Rheumatoid arthritis and heart risk
Mood: depression and anxiety are common and treatable causes
A systematic review of 72 studies and 13,189 people with rheumatoid arthritis found confirmed major depressive disorder in 16.8% (95% CI 10 to 24%), and depressive symptoms on a screening questionnaire in 38.8% [10]. This fits with depression being among the strongest factors linked with fatigue [1].
The relationship runs both ways: pain and poor sleep damage mood, and low mood damages sleep and adds to fatigue. The NHS says feelings of stress and anxiety can be related to poorly controlled pain or fatigue, and advises speaking to your healthcare team [21].
What to tell your doctor: that you have lost interest in things you used to enjoy, feel persistently sad or anxious, cannot concentrate, or that racing thoughts break your sleep. This is not weakness. It is a symptom that gets assessed like any other, and your doctor can discuss options and refer you to a specialist if needed.
Medicines: what to report without changing anything yourself
A basic rule: do not stop a medicine, change its dose or move its timing yourself, even if you suspect a link with tiredness or sleep. That decision belongs to the prescriber alone, and the NHS advises taking medicine as instructed even when you feel better [21].
Corticosteroid (prednisone): difficulty falling or staying asleep is a listed side effect in the US National Library of Medicine leaflet, and so is increased sweating [14]. Ask your doctor whether the timing of your dose could play a part in your sleep, and let them decide.
Methotrexate: extreme tiredness, lack of energy, loss of appetite, nausea, paleness and shortness of breath are symptoms to report to your doctor immediately [16]. The regular blood tests your doctor orders are an important part of safety.
Hydroxychloroquine: the leaflet lists mood changes, and excessive tiredness together with signs such as yellowing of the skin or eyes, among symptoms to report [15].
Before the visit, prepare a list of every medicine with its dose and timing, including painkillers and supplements, and note when the tiredness or insomnia appeared relative to starting any medicine or changing a dose.
Pacing and activity: what has evidence behind it
A Cochrane review pooled 24 studies with 2,882 participants. Physical activity and exercise reduced fatigue with a small-to-moderate effect (standardised effect -0.36, 95% CI -0.62 to -0.10, about 7 people treated for one to benefit), with moderate-quality evidence. Psychosocial interventions had a smaller effect (-0.24, 95% CI -0.40 to -0.07, about 10 people per benefit), with low-quality evidence. Few adverse events were reported and none were serious [2].
The RAFT trial in the United Kingdom (333 patients) tested a 7-session group course using cognitive behavioural approaches, delivered by rheumatology teams. It reduced the impact of fatigue on life on a 0 to 10 scale by -0.59 (95% CI -1.11 to -0.06) at 26 weeks and -0.49 (95% CI -0.83 to -0.14) at two years [3]. The difference is real but modest, so expect gradual improvement, not a cure.
In practice, the NHS advises a balance between rest and movement. Rest comforts inflamed joints, but without movement joints stiffen and muscles weaken. During a flare rest more, and if an activity causes severe pain, stop and rest [21]. Split tasks across the day, rest before you reach the end of your energy, and score your fatigue from 0 to 10 each day to see the trend. These steps are sensible, but no separate trial has proved each one on its own.
Read also: Exercise for joint pain and arthritis
Sleep habits to try, and how strong the evidence is
Simple sleep habits are cheap and harmless, but in the sources we reviewed there are no rheumatoid arthritis trials proving each habit on its own, so the evidence here is indirect. For restless legs, the NHS suggests steps that help sleep in general [19]: • Be active and exercise during the day. • Try to go to bed and wake up at the same time every day. • Keep your bedroom dark and quiet.
Another sensible step: keep notes about night pain. Pain that wakes you is worth telling your doctor about, since pain is strongly linked with poor sleep in rheumatoid arthritis [4]. Also, if someone notices your snoring or pauses in breathing, tell your doctor rather than treating it as a sleeping habit [18].
If you have had persistent insomnia for months, ask your doctor about cognitive behavioural therapy for insomnia. The evidence for it in rheumatoid arthritis comes from one small trial with an inconclusive objective result, as noted above [11].
Food: is anything forbidden with rheumatoid arthritis?
The sources we reviewed do not name a particular food that is forbidden for everyone with rheumatoid arthritis. What is available: the NHS recommends healthy eating and regular exercise for everyone, including people with rheumatoid arthritis, and excess weight puts extra strain on the joints [21].
Weight also relates to sleep: obesity is listed as a risk factor for sleep disorders in rheumatoid arthritis [5], and losing weight is among the steps that can ease sleep apnoea if you are overweight [18]. Weight gain with tiredness and feeling cold makes a doctor think of the thyroid [20].
So do not cut out whole food groups because of a social media list. If you feel a certain food worsens your symptoms, note it and discuss it with your doctor. If weight is part of the problem, we offer clinical nutrition and weight management, and an InBody device analyses body composition.
When to book a rheumatology visit
Book a visit if: • Your tiredness and sleep affect your work or life, or are getting worse [1]. • Morning stiffness, joint swelling or night pain has increased [17]. • You have repeated fever or sweating, or unexplained weight loss [17]. • You have loud snoring with choking during sleep, or morning headaches [18]. • You have a strong urge to move your legs at night [19]. • You notice paleness, breathlessness, or feeling cold with weight gain [16][20]. • You feel persistently sad or anxious [10].
What to bring: a two-week log of fatigue (0 to 10) and sleep, your medicine list with doses, and any old test results. Dr Shimaa Sherif (rheumatology) is available at Maadi and Fifth Settlement, and Dr Mohab Ashraf Fouad (internal medicine) at Maadi only if you need an assessment of general causes of fatigue. Guided exercise and physiotherapy are external referrals, and we will explain any sleep study or test you need.
Branches: Maadi (14 El-Mokhtar Street, behind QNB, New Maadi) and Fifth Settlement (CMC Medical Mall, 4th floor, North 90th Street, Wednesdays from 3:30 pm). Book from the link below.
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