Why Does My Hip Hurt When I Lie on My Side at Night?
If lying on your side at night makes one hip ache, throb, or feel bruised to touch, you're not imagining it, and it's probably not your mattress either. That specific ache, the one that wakes you when you roll onto it, or nags for the first few minutes after you shift sides, points to something specific going on in the hip itself.
Here's the short answer: the outside of the hip is packed with tendons and a bursa that get compressed every time you lie directly on them, so a hip that's already a bit irritable lights up the moment you put your body weight straight through it. That's why the pain often eases once you get up and move, then creeps back the second you lie down again.
So hip pain at night isn't random, and it isn't just "getting older". It's usually a specific structure telling you it's had more compression or load than it can currently tolerate.
The usual suspects
Gluteal tendinopathy. The gluteus medius and minimus tendons attach right where you feel the ache, on the bony point of the hip. They're the single most common cause of one-sided night hip pain, especially from your 40s onward.
Hip bursitis. The trochanteric bursa sits over those same tendons to reduce friction. When the tendons are irritated, the bursa often gets irritated too, adding swelling and sharpness on top of the ache.
Referred pain from the back or SI joint. Sometimes the hip itself is fine and the pain is travelling down from a stiff lower back or SI joint. This usually comes with some back stiffness too, even if it's mild.
Hip osteoarthritis. Wear and tear inside the joint itself tends to sit more in the groin than the side of the hip, and usually comes with morning stiffness that eases as you move, but it can contribute to night pain too.
The mistake almost everyone makes
Stretching it out. When a tendon is irritated, a big stretch can feel like exactly what it needs, and it might even feel better for a few minutes. But stretching an irritated gluteal tendon compresses it further against the bone underneath, which tends to wind the irritation up rather than calm it down. It's the same reason foam rolling straight over the sore spot often makes it feel worse the next day, not better.
Three things to try this week
Change your sleep position. Try lying on your back, or on the pain-free side with a pillow between your knees, so nothing is compressing the sore hip directly through the night.
Skip the deep stretch and the foam roller. Ease off anything that presses directly onto the outside of the hip for a couple of weeks and see if the nighttime ache settles.
Add light isometric hip work. Gentle, held contractions, like pressing your knee out against a pillow or a wall, can calm an irritated tendon down without aggravating it, and are a good starting point before building back to normal strength work.
When to get it looked at
Most night hip pain settles with a few sensible changes, but it's worth getting assessed if the pain is getting worse rather than better, if it's stopping you from sleeping most nights, if you've had a fall or a specific injury, or if it comes with fever, unexplained weight loss, or pain that doesn't ease at all with rest. At TAP we start by working out exactly which structure is driving your pain, whether that's tendon, bursa, back, or joint, because the right plan is different for each one, then build a loading and recovery programme around it rather than just telling you to rest and see.
Quick answers
Is it my mattress? Rarely, on its own. A very soft or old mattress can make an already irritated hip worse, but if only one side hurts, the hip is usually the real issue, not the bed.
Will I need a hip replacement? Almost never, for this kind of pain. Gluteal tendinopathy and bursitis respond well to load management and targeted strengthening; a replacement is really only relevant for advanced hip osteoarthritis.
Do I need a scan? Not usually to begin with. A clinical assessment normally tells us enough to start the right treatment, and scans are kept for cases that aren't improving as expected.
Want the full picture on your specific hip pain? Visit our hip pain page for the conditions we treat, what assessment looks like, and honest recovery timelines.
Tired of losing sleep to a hip that won't settle? We can usually see you the same week at Warwick or Stratford-upon-Avon, no GP referral needed. Book your assessment or learn about physiotherapy in Warwick and physiotherapy in Stratford-upon-Avon.
