Does your knee catch and ache going down stairs?
Squatting down is fine, but standing back up needs a hand on something?
First thing in the morning, the knee feels tight and stiff, and only loosens up after a few steps?

If any of that rings true, one thought has probably already crossed your mind:

"Are my knees going?"

Don't panic yourself just yet.

What people casually call "worn-out knees" usually refers, medically, to knee osteoarthritis. It is associated with age, but it doesn't only happen to older people.

So which symptoms are worth paying attention to? Can you still exercise with knee pain? Do squats, running and hiking all have to stop? And what should everyday care actually look like?

This article covers all of it.

Knee pain and clicking - does that mean osteoarthritis?

Not necessarily.

The knee is a complex structure containing cartilage, menisci, ligaments and tendons. Knee osteoarthritis isn't simply "the cartilage has worn away" - it's a series of changes across different tissues in the joint over time.

With age, or when a knee carries heavy loads over long periods, changes can gradually appear in the joint cartilage and other tissues, which in turn cause pain, stiffness and reduced ease of movement.

Common risk factors include:

• Increasing age
• Excess body weight
• Previous knee injury or surgery
• Long-term activities involving a lot of squatting, kneeling or load-bearing
• Insufficient muscle strength or altered lower-limb function
• Certain congenital or structural factors

So knee pain doesn't automatically mean degeneration, and a noisy knee doesn't mean the cartilage has worn through.

Establishing the real cause takes both your symptoms and a professional examination.

What are the common symptoms of knee osteoarthritis?

If your knee hasn't felt as free-moving as it used to, look out for the following.

1. Stiffness in the morning or after sitting a while

Getting out of bed, or standing up after sitting for a stretch, the knee feels tight and sticky.

After a few steps and a bit of movement, it gradually loosens again.

That pattern - stiff to start, easier once you move - is fairly common in knee osteoarthritis.

That said, if morning stiffness lasts a very long time, or other joints are clearly stiff too, it isn't necessarily just osteoarthritis and other joint conditions may need ruling out.

2. Pain specifically on stairs

Level ground is fine, but stairs set the knee complaining.

Pain at the front of the knee going up and down stairs may relate to the increased load the joint is carrying.

But note that stair pain is not exclusive to knee osteoarthritis.

Patellofemoral pain syndrome, weak muscles and other knee problems can all present similarly.

So don't conclude your knee is degenerating on the basis of stair pain alone.

3. Squatting and standing up become hard work

Crouching to pick something up used to be automatic, and now:

"Going down is fine - it's getting back up that's the problem."

Sometimes you need a table or chair to push up from.

If this keeps happening and it's affecting daily life, it's worth having a doctor or physiotherapist assess it.

4. A knee that keeps swelling

If your knee swells easily after activity, or one knee looks clearly different from the other, there may be inflammation or fluid in the joint.

If the knee is also clearly red, warm, swollen and severely painful, don't file it under "normal wear and tear".

Besides osteoarthritis, other conditions can cause acute inflammation or swelling in a knee, and that needs a doctor's judgement.

5. What about clicking and popping?

Before a single click sends you to:

"That's it, my cartilage must be gone."

Noise from a moving knee is actually very common, and sound on its own doesn't indicate degeneration or worn cartilage.

But if the noise comes together with:

• Pain
• Swelling
• Catching or locking
• A reduced range of movement
• Inability to fully straighten or bend

then it's worth investigating further.

How bad does knee pain have to be before seeing a doctor?

If it's just occasional soreness after a lot of walking or standing that settles with rest, you can watch it for now.

But if any of the following apply, don't keep "waiting it out":

• Pain that hasn't improved over a period of time
• Pain that's affecting the way you walk
• Stairs have become clearly difficult
• The knee keeps swelling
• The knee is visibly red and warm
• Sudden severe knee pain
• The knee catches, or won't fully straighten or bend
• It's affecting your sleep or daily life

In particular, sudden severe pain, marked swelling, or an inability to bear weight should be seen promptly.

Also, knee osteoarthritis can't be confirmed by an online symptom checklist.

A doctor will usually ask where it hurts, when it started, what you've been doing and your medical history, then carry out a physical examination.

Imaging such as X-rays is arranged only where it's needed.

Not everyone with knee pain needs an X-ray straight away.

Can you still exercise with knee osteoarthritis?

For a lot of people, hearing "knee osteoarthritis" prompts one reaction:

"So I shouldn't move it much, right?"

Actually, the opposite.

For most people with knee osteoarthritis, moderate, regular exercise is an important part of both treatment and ongoing care.

Strength training helps improve leg strength and everyday function; aerobic exercise helps maintain general fitness.

So the point isn't:

"My knee hurts, so I shouldn't move at all."

It's:

"Find the kind of exercise that suits me, and manage the intensity and the load."

Three types of exercise that tend to suit knees

1. Strength training

Target the lower-body muscles, particularly the thighs and glutes.

Quadriceps work, seated leg raises and glute strengthening can all be scaled to your current ability.

If you have no exercise habit at all, start with simple, low-load movements and build intensity gradually.

If pain clearly worsens after a session, or swelling persists, the current training volume probably needs adjusting.

2. Exercise in water

Swimming and water walking use the buoyancy of water to reduce the load your body weight places on your legs.

If walking or exercising on land tends to be uncomfortable, water offers an alternative.

3. Low-impact aerobic exercise

For example:

• Stationary bike

• Spin bike

• Elliptical trainer

• Swimming

These generally place less impact on the joint than running and jumping.

That said, every knee is different - "low impact" doesn't automatically mean suitable for everyone, so adjust according to your own pain and capacity.

So squats, running and hiking are all off the table?

Not necessarily.

This is one of the biggest misconceptions about knee degeneration.

Having knee osteoarthritis doesn't mean never squatting, running or hiking again.

What actually matters is:

how much load your knee can currently handle.

If an activity clearly increases your pain and the discomfort persists after rest, then the volume or the movement itself probably needs adjusting.

Work through it in this order:

reduce the weight → reduce the reps → shorten the duration → lower the impact

rather than moving every activity straight onto a banned list.

If you already have clear pain, swelling or restricted movement, have a doctor or physiotherapist assess you first and decide what suits from there.

Everyday care for knee osteoarthritis

Beyond exercise, a few everyday habits matter too.

Managing your weight

If you're overweight or obese, losing weight reduces the load on the knee joint and can help improve both pain and physical function.

For people carrying excess weight, weight management is one of the important treatments for knee osteoarthritis.

But if your weight is already in a normal range, there's no need to lose weight deliberately to "protect your knees".

Don't hold a squat or kneel for long stretches

If your work or daily life involves long periods squatting or kneeling, change position and get up to move around from time to time.

The point isn't that one squat will ruin a knee - it's about avoiding long periods with the knee under high load.

Choose shoes for comfort and stability

If you walk a lot every day, choose shoes that fit, feel comfortable, and give you a stable stride.

There's no need to chase a particular "miracle knee shoe" or special insole.

For most people, comfortable and stable to walk in matters more than whether the shoe claims to treat knees.

Do you need a knee brace?

A knee brace isn't something everyone with knee pain needs.

Some people with joint instability or particular mechanical issues may be suited to a brace after professional assessment.

But a brace shouldn't be treated as standard kit for everyone with knee osteoarthritis.

And if you've reached the point of needing a brace long-term just to walk or exercise, that's all the more reason to have a professional identify what's actually going on.

Do glucosamine, UC-II and PRP actually work?

Search for knee degeneration and you'll quickly run into glucosamine, UC-II and PRP.

But they shouldn't all be lumped together.

Can glucosamine treat knee degeneration?

There isn't currently consistent enough evidence that glucosamine effectively improves knee osteoarthritis, and some clinical guidelines therefore do not recommend it as routine treatment for osteoarthritis.

More importantly:

glucosamine is not a way to "eat your worn cartilage back".

If you're considering a supplement, look into the ingredients and your current medications, and discuss it with a healthcare professional first.

Is UC-II useful?

UC-II (undenatured type II collagen) is another common joint supplement.

Research to date is still limited, and there isn't consistent enough evidence to draw conclusions about its real effect on knee osteoarthritis.

So UC-II shouldn't be treated as a primary approach to knee degeneration.

Can PRP treat knee degeneration?

PRP is platelet-rich plasma - platelets are concentrated from your own blood and the plasma is then injected around or into the joint.

Some studies suggest PRP may help certain people with knee osteoarthritis improve pain and function, but findings are not entirely consistent.

So PRP is not:

"one injection and the cartilage grows back".

If you're considering PRP, a doctor should assess whether it suits you based on the degree of degeneration, your symptoms and the other treatment options - rather than deciding straight off an advert.

Knee pain isn't always degeneration - don't rush to diagnose yourself

Catching, aching and clicking don't mean your knee is definitely degenerating.

Knee pain has many causes. Besides osteoarthritis, it can involve weak muscles, patellar problems, ligaments, menisci or other joint conditions.

So what matters isn't labelling yourself with "knee degeneration" first - it's:

find the cause, then decide what to do about it.

If it's only occasional discomfort, watch it and adjust your activity.

If the pain persists, the knee keeps swelling, or it's affecting walking and stairs, stop trying to tough it out.

Having a doctor or physiotherapist work out where the problem is, and then choosing the right exercise and treatment, is usually far more practical than buying supplements at random.

And finally, remember:

knees don't last longer by being used less.

Real care means finding the activity that suits you, keeping enough strength, and dealing with persistent problems early.

The goal isn't a knee you're afraid to use - it's a knee you can use well, and keep using.