Conditions

Knee Pain at Night: Why It Hurts in Bed and When to Worry

Quick answer

Knee pain at night is most often caused by osteoarthritis, inflammation inside the joint or an irritated tendon or bursa, and it usually improves once the cause is treated. Constant night pain that does not change with position, or comes with fever or weight loss, needs prompt assessment, advises Dr. Pablo Gelber, knee surgeon at Aman Hospital in Doha.

Why knee pain can feel worse at night

During the day, movement, work and conversation distract the brain from a sore knee. Lying still in a quiet room removes those distractions, so the same level of irritation feels stronger. Joints also stiffen when they are not moving, and fluid can collect in an inflamed knee after a busy day.

The pattern of the night pain is a useful clue. Pain that comes on when you roll over or bend the knee in bed usually comes from the joint or a tendon. Pain that is there however you lie, and builds through the night, behaves differently and deserves a closer look.

Common causes of knee pain at night

Osteoarthritis: a deep ache after a day on your feet, with morning stiffness that eases within about half an hour; in more advanced arthritis the ache can wake you
Inflammation of the joint lining (synovitis) or a flare of inflammatory arthritis: a warm, swollen knee that is stiff for longer in the morning
Gout or pseudogout: sudden, very painful swelling, often starting overnight, so that even the bedsheet touching the knee hurts
Pes anserine bursitis or tendinopathy on the inner knee: tender to touch, often worse lying on your side with the knees pressed together
A meniscus tear: pain when turning in bed or with the knee bent, sometimes with catching
Pain referred from the hip or lower back: the knee examines normally, but the hip is stiff or the back is sore
In children, growing pains: an ache in both legs in the evening, without a limp or swelling, that is gone by the morning

Red flags that should not wait

A hot, red, swollen knee with fever or chills: possible joint infection, call 999 or go to an emergency department
Constant pain that does not ease with rest or position and wakes you every night
Unexplained weight loss, night sweats or a history of cancer
A new lump or swelling around the knee, especially in a child or teenager
A swollen, tender calf, particularly after surgery or a long flight
A child who limps, will not walk or wakes in pain in only one leg

These are uncommon, but they are the reasons night pain is taken seriously. Bone tumours around the knee are rare, and are usually picked up early with an examination and an X-ray.

How it is diagnosed in Doha

Dr. Gelber asks when the pain starts, whether position changes it, how long morning stiffness lasts and whether other joints are affected. The examination looks for swelling, warmth, tenderness at specific points, meniscus signs and how the hip moves.

X-rays show arthritis, alignment and bone changes. If the knee is swollen, a small sample of fluid can be drawn with a needle and tested for crystals or infection. Blood tests help when inflammatory arthritis or infection is possible. MRI is used for suspected meniscus, cartilage or bone problems, or when night pain is unexplained.

Easing night pain while the cause is treated

Small changes often help. Lying on your back with a thin pillow under the knee, or on your side with a pillow between the knees, takes pressure off sore areas. Avoid sleeping with the knee fully bent for hours. Gentle cycling or a short walk in the evening can reduce stiffness, while very long days on your feet tend to make nights worse.

Ice for 15 minutes before bed suits a warm, swollen knee, while warmth often suits a stiff, arthritic one. Pain relief advised by a doctor or pharmacist, taken at the right time, can make sleep possible. In Ramadan, when meals and sleep move later, many patients plan medication with their doctor around suhoor and iftar.

Longer term, treatment targets the cause: strengthening and weight management for arthritis, injections in selected cases, treatment of gout or inflammatory arthritis, and surgery only when a structural problem is clearly responsible.

When to book at Aman Hospital

Book an assessment if knee pain has woken you on several nights over two weeks or more, if the knee is swollen, or if simple measures have not helped. Night pain is one of the symptoms that often tips the balance towards treatment for arthritis, so it is worth discussing even if you have lived with the knee for years.

Frequently asked questions

My knee is fine all day but aches as soon as I lie down. Is that arthritis?

It can be. Early arthritis and tendon problems often feel worse when you finally rest. An examination and an X-ray usually show whether arthritis is present and how much.

Should I sleep with a pillow under my knee?

A thin pillow for comfort is fine. Avoid propping the knee bent for long periods every night, as it can make it harder to straighten fully, especially after surgery.

Can knee pain at night be cancer?

It is rare. Most night pain comes from arthritis or inflammation. Pain that is constant, worsening, not related to position, or comes with a lump or weight loss should be examined promptly.

My child wakes up crying with leg pain. Is it growing pains?

Growing pains usually affect both legs, come in the evening, and are gone by morning with normal walking. Pain in one knee, a limp, swelling or fever needs a doctor to check.

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