Why your knee hurts only when going down stairs, not up

Going up takes more effort, so why is it going down that hurts?

Key points in 30 seconds

1. When you climb stairs, your thighs are the engine; when you go down, they're the brakes. The braking work of holding and lowering your body is harder for the muscles, and the pressure on the knee becomes much greater than on flat ground.
2. So pain only when going down is read as a sign that your braking strength is falling short.
3. Where it hurts is the fork in the road. If it's around the kneecap at the front, we look at pressure on the kneecap; if it's the inside of the knee, we look first at leg alignment and weight.
4. On the stairs today, hold the railing and bring both feet together on each step as you go down. It's better to carry bags in a backpack, close to the center of your body.
5. The underlying direction is thigh strength: rebuilding your brake pads.

What we often hear

• "Going up, I just get out of breath and my knees are fine, but going down, every step aches."
• "I thought I was just being a baby about it, so I put up with it."
• "I figured it was because I don't exercise enough."
• "The front of my knee feels stiff when I get up after sitting for a long time, too."

Going up seems to take more effort, yet going down is what hurts. Many people find it strange but just let it go.

There's a reason it hurts only on the way down, and that reason points the way for treatment.

Going up, an engine; going down, a brake

When you climb stairs, your thigh muscles work like an engine, generating force to push your body up.

Going down, they do a different job. They hold back your body weight as it tries to drop, and lower it slowly. This movement, where the muscle resists while lengthening, is harder work for the muscle. At this point, the pressure on the knee joint and the kneecap (patella) at the front of the knee becomes much greater than when walking on flat ground.

So we read pain on the way down like this: the brake pads are worn, or the strength to press the brake is falling short. When the thighs can't absorb the impact, it goes straight into the joint.

The same explains why going up is fine. The engine work still gets done, but the braking work is a struggle.

It depends on where it hurts

If it hurts at the front, around the kneecap. If, besides going down stairs, it also feels stiff when you get up after sitting a long time, we first think of the type where pressure between the kneecap and thighbone has increased. It's common in younger people and in people who suddenly increased how much they exercise.

If the inside of the knee aches. If it's mainly the inside that hurts after middle age, we look at a structure where load is shifting to the inner side of the joint. Legs that bow outward, or bow legs, are a leading factor that increases load on the inside, and body weight multiplies it. We've written up this relationship in the bow legs evidence post.

This sorting is an estimate, not a diagnosis. The location and pattern of pain can overlap, so the actual check is done through examination and, if needed, imaging.

Signs to look at before talking about stairs

If you have any of the following, the state of your knee needs to be checked before thinking about type.

• The knee is swollen and feels hot to the touch
• It hurts even when lying down and resting at night
• While walking, the knee catches and locks, or gives way
• It started hurting after a fall or a bump

At times like this, brushing it off with "that's just what happens with age" is the riskiest thing you can do. When we see these signs, we check the joint first in partnership with the radiology clinic on the 2nd floor of the same building.

Tips to use on the stairs today

Hold the railing. It's nothing to be embarrassed about; it's sharing the braking work.

Bring both feet together on each step as you go down. The more you slow down, the less impact your knee has to absorb.

Carry bags in a backpack. Keeping the load close to the center of your body puts less on your knees than splitting it between both hands.

How best to walk and take stairs day to day is written up as a "do it like this" list in the knee walking post.

The underlying direction is rebuilding the brake pads

For knee arthritis, the treatment that major clinical guidelines name first is exercise, and at its center is leg strength, including the thighs. The evidence is in the knee arthritis evidence post.

Pain going downhill is exactly what this prescription targets. When your holding strength comes back, the joint takes less impact on the same stairs.

Start by slowly standing up from a chair and sitting back down. We set the method and number of reps at your visit to match your knee.

Care follows this order

First, we sort things out. We look at where it hurts, the pattern, and the warning signs above, and if needed, check together with the radiology clinic on the 2nd floor.

Second, we measure the load. We look at leg alignment with an X-body posture analysis, and at weight and muscle mass with an InBody test.

Third, we build up the brakes. We manage pain with acupuncture and pharmacopuncture (herbal acupuncture) so you can start exercising, set thigh-strengthening exercises as "do it like this," and check at your follow-up visit.

We track progress with your pain score and how many steps you can comfortably go down.

What changes

A day when you turn toward the stairs first instead of waiting for the elevator. A day when you hold the railing going down, not because it aches, but out of habit.

Those stairs are what we're aiming for.

How fast things improve differs from person to person depending on the type of pain, leg alignment, weight and strength.

Today's takeaway

A knee that hurts only going down isn't you being a baby about it. It's a sign your brakes are falling short.

As you go down the stairs today, jot down just two things. Whether the pain is at the front or the inside of the knee, and whether it also feels stiff when you get up after sitting a long time. If you bring those two lines with you, the first step of your visit will go much faster.

For questions or appointments, message us in English through the messenger at the bottom right of the page, or call +82-53-716-1175.