Why does my hip hurt when I lie on my side?

Side lying concentrates body weight on the greater trochanter, the bony prominence on the outside of the hip. Sustained pressure reduces blood flow to the bursa and gluteal tendons there, causing sharp pain. This is greater trochanteric pain syndrome (GTPS), the most common cause of lateral hip pain, affecting women about 4 times more often than men.

Is hip pain at night a sign of something serious?

Positional pain that eases when you change sides is usually GTPS or bursitis. See a doctor if pain wakes you regularly, you limp, morning stiffness lasts over 30 minutes, or pain comes with fever, inability to bear weight, or numbness down the leg — those can indicate arthritis, a labral tear, or infection.

How can I sleep without hip pain?

Sleep on the non-painful side with a firm pillow between your knees to keep the pelvis level, avoid lying directly on the painful hip, use a medium-firm mattress, ice the tender spot 15-20 minutes before bed, and strengthen the hip abductors during the day with clamshells and side-lying leg raises.

Sharp Pain in Hip When Lying on Side — Causes, Relief & When to See a Doctor

Why Does Your Hip Hurt Sharp When You Lie on Your Side?

A sharp pain on the outside of the hip when you lie on that side is usually pressure and friction on the greater trochanter — the bony prominence you can feel on the outer hip — and the structures that glide over it. The most common culprit is greater trochanteric pain syndrome (GTPS), an umbrella term for inflammation of the bursa (a fluid-filled cushion) and irritation of the gluteal tendons that attach there. When you lie on the affected side, the full weight of your body presses this already-irritated area into the mattress, and the pain can be sharp enough to wake you.

GTPS is far more common than most people think: studies estimate it affects roughly 10–25% of adults at some point, with the highest rates in women aged 40–60 and in runners. Side-sleeping is the most common sleep position — around 40–60% of people sleep on their side — which is why this specific complaint is so common. The pain typically eases within minutes of rolling onto the back, which is itself a useful diagnostic clue.

Quick Check

Sharp pain on the outer hip that appears when lying on that side, is tender to press, and eases when you roll over is very likely GTPS — highly treatable with physiotherapy. If the pain is deep in the joint, spreads down the leg, or comes with fever or a fall, check the Doctor page.

How Common Is It?

Greater trochanteric pain syndrome affects roughly 10–25% of adults, is about twice as common in women, and peaks between ages 40 and 60. It is one of the most common causes of hip pain in primary care — in some studies it accounts for a larger share of hip pain presentations than hip osteoarthritis. Symptomatic hip osteoarthritis, by comparison, affects about 10% of people over 55. Side-sleeping (40–60% of people) is the reason the lying-down version of this pain is so common.

Why Lying on Your Side Hurts

Pressure: your body weight presses the tender outer hip into the mattress.
Friction: the tight band of tissue over the hip (the iliotibial band) presses onto the irritated bursa and tendons.
Position: a narrow hip or a firm mattress concentrates the pressure on the bony point.
Underlying irritation: gluteal tendon overload from running, stairs, or sitting — the actual driver that makes pressure painful.

What You Can Do Tonight

Sleep on the other side, or on your back with a pillow under the knees.
Put a pillow between the knees when side-sleeping to open the hip and reduce the angle of strain.
Use a thicker mattress topper or a pillow under the hip to spread the pressure.

Full relief strategies →

When to See a Doctor

See a doctor if the pain persists for more than two weeks despite sleep changes, if it is deep in the joint or groin, if it spreads down the leg, if it follows a fall, or if it comes with fever or trouble bearing weight. The Doctor page has the full framework — but most outer-hip night pain is GTPS, and physiotherapy resolves the majority of cases.

How Long Does Side-Lying Hip Pain Usually Last?

Position-related flares often settle within nights of sleep changes — pillow support and back-sleeping remove the pressure that triggers the pain, and many people feel improvement within a week. GTPS treated with gluteal strengthening typically improves over 8–12 weeks, which is the normal tendon-recovery timescale. Hip OA pain follows the joint: it varies with activity and responds to strengthening and load management over months. The threshold that matters: outer-hip night pain that persists beyond two weeks despite sleep changes, or that is now present during the day, warrants an assessment rather than more nights of the same.

Frequently Asked Questions

Is it bursitis or the hip joint?

The location answers most cases. Bursitis and gluteal tendon pain sit on the bony outer hip, are tender to press, and hurt with side-lying and stairs. Joint (OA) pain sits deeper, often in the groin, and hurts with weight-bearing and first thing in the morning. Outer pain that eases on rolling over is overwhelmingly soft tissue.

Should I stop running?

Not necessarily. Complete rest weakens the gluteal tendons further — the opposite of what they need. Reduce volume temporarily, keep pain during activity at a comfortable level, and build the gluteal strength that takes load off the tendons. A physiotherapist can tailor this to your sport.