Knee pain at night: what causes it and what helps

Reviewed by The Wellness Team. Last reviewed October 2026.

Short answer: knee pain that wakes you at night is common, and osteoarthritis is the most frequent cause. Versus Arthritis notes that people with knee osteoarthritis sometimes have pain that wakes them in the night. Most night pain responds to the same core treatments that help daytime pain: strengthening exercise, weight management where relevant, and anti-inflammatory gel. Pain that is constant, getting steadily worse, or comes with a hot, red, swollen knee or a fever needs checking promptly.

Why knees hurt more at night

There are ordinary reasons pain feels worse in bed. The day goes quiet and there is nothing to distract you. Knees that have carried you all day can stiffen once you stop moving, and a bent-knee sleeping position keeps irritated structures under pressure. Inflammatory conditions also follow a daily rhythm, which is why gout and other inflammatory problems classically strike at night.

None of this means night pain is "all in the mind". It means the cause is usually the same one driving your daytime symptoms, simply more noticeable.

The usual causes

The NHS knee pain guide matches patterns to likely causes. Pain and stiffness in both knees, more common in older people, suggests osteoarthritis. Sudden attacks of very bad pain with a hot, red knee suggest gout or, rarely, joint infection. Pain and swelling made worse by kneeling or bending points towards bursitis. Swelling with warmth and bruising, particularly in people on anticoagulants, can be bleeding into the joint.

Osteoarthritis is the one we see most. Versus Arthritis describes soft swelling when the joint produces extra fluid, symptoms that vary day to day, and pain that can wake people at night. If that pattern sounds familiar, our guide to knee osteoarthritis and what to try before an injection goes deeper.

When night pain needs a doctor quickly

The NHS advises getting advice from 111 now if your knee is very painful, you cannot move it or put weight on it, it is badly swollen or has changed shape, it locks or gives way, or you have a high temperature with redness or heat around the knee, which can signal infection. See a GP if knee pain does not improve within a few weeks.

One more pattern deserves respect: night pain that is constant, progressive and unrelated to position or activity, especially with unexplained weight loss or feeling generally unwell. That is not typical of osteoarthritis and should be assessed.

What helps tonight

Small, practical things make a difference while you sort the underlying problem:

• A pillow between your knees if you sleep on your side, or under your knees if you sleep on your back, takes pressure off the joint.
• The NHS suggests an ice pack wrapped in a tea towel for up to 20 minutes every 2 to 3 hours when a knee is inflamed, and painkillers such as paracetamol or ibuprofen gel.
• Versus Arthritis suggests a sleep diary to spot patterns, regular sleep times, and keeping screens out of the bedroom, because poor sleep makes pain feel worse.

What actually fixes it

For knee osteoarthritis, NICE (guideline NG226) puts therapeutic exercise and, where relevant, weight management at the centre of treatment, with topical anti-inflammatory gels for flare-ups. These are not soft options: strengthening the muscles around the knee is the intervention with the strongest evidence for reducing pain and improving function.

Steroid injections can settle a flare for a few weeks but do not change the course of the condition. PRP is the option people ask us about most. The honest summary: the evidence is mixed. The largest placebo-controlled trial in mild to moderate knee osteoarthritis (the RESTORE trial, JAMA 2021, 288 adults) found PRP no better than saline at 12 months, while other trials and reviews report benefit. We discuss that evidence openly before anyone books, because an injection is never a substitute for the core treatments above.

If you do decide to explore PRP, a joint PRP session with us is £750, ultrasound guided, and our PRP joint injection cost and booking guide explains exactly what is included. Message us on WhatsApp for a straight answer on whether your pattern sounds suitable.

Frequently asked questions

Is knee pain at night serious? Usually not. It is a common feature of osteoarthritis and most causes respond to ordinary treatment. Constant, progressive night pain unrelated to movement, or night pain with fever, redness or a hot swollen joint, should be checked promptly.

Why is my knee fine in the day but painful at night? Reduced distraction, stiffness after a day of loading, and a bent sleeping position all amplify pain that was there all along. Inflammatory conditions also flare at night.

What is the best sleeping position for knee pain? On your side with a pillow between your knees, or on your back with a pillow under them. The goal is to avoid the joint resting in a tightly bent or twisted position.

Will PRP stop my knee waking me at night? The evidence is mixed, so no honest clinic will promise that. We start with an assessment, talk through the trials, and only proceed if the balance makes sense for you.

If knee pain is disturbing your sleep, message us on WhatsApp and we will tell you plainly what we would check first.