Why does the front of my knee ache at night in bed?

Why knees often ache more at night

At night there are fewer distractions, so the same level of irritation feels stronger. The knee is also still, which lets mild inflammation and stiffness build. Sleeping curled up with the knees fully bent presses the kneecap into its groove for hours, much like sitting through a long flight.

A throbbing ache after a day of stairs, standing, sport or a long walk usually reflects overload that settles with a quieter day. Night pain that appears regardless of what you did is more significant.

Common and less common causes

• Patellofemoral pain or softened cartilage behind the kneecap, worse after an active day
• Arthritis of the kneecap or the whole knee, where night ache becomes more frequent as it progresses
• Bursitis over or below the kneecap, sore when the knee rests against the other leg or the mattress
• Patellar tendinopathy flaring after jumping or heavy training
• Rarely, infection, inflammatory arthritis or a bone lesion, which typically cause constant pain not linked to activity

Sleep and evening tips

Try sleeping on your back with a pillow under the knees for slight bend, or on your side with a pillow between the knees so the kneecaps do not press together. Avoid tucking the legs up tightly.

If the ache follows activity, a cold pack for 15 minutes before bed can help, and gentle range-of-motion exercises loosen the joint. Spread demanding tasks across the week rather than concentrating them in one day. Simple pain relief taken before bed may help in the short term if it is safe for you.

When night pain needs a specialist

See a doctor promptly if pain wakes you most nights for more than two weeks, if it is constant regardless of activity, or if you have fever, unexplained weight loss, a hot red knee, or a history of cancer. In children and teenagers, persistent night pain in one knee or the thigh should always be examined.

At Aman Hospital in Doha, Dr. Gelber takes a detailed history of the pain pattern, examines the knee and arranges X-rays or other tests when the night pain is not explained by an overload condition.