If your knee hurts, start by figuring out whether it needs urgent attention or home care. Most knee pain improves within a few days to weeks with rest, targeted exercises, and simple pain management. But certain symptoms signal something more serious that warrants a trip to the emergency room. Here’s how to sort out what you’re dealing with and what to do next.
Signs You Need Emergency Care
Most knee pain is not an emergency, but a few red flags mean you should get medical help right away. According to the Mayo Clinic, seek emergency care if your knee pain comes with any of these:
- Severe pain or bleeding after an injury
- Visible deformity or a knee that looks out of place
- Exposed bone or tendon
- Sudden swelling or redness
- Inability to bend your knee or bear weight
- A popping sound or snapping sensation at the time of injury
- Fever and chills alongside knee pain
If none of those apply, you can likely manage things at home for the first few days while you figure out what’s going on.
What to Do in the First 48 Hours
For a new injury or a sudden flare of pain, your first job is to protect the knee and control swelling. The older advice you may have heard (rest, ice, compression, elevation) still has value, but sports medicine has moved toward a broader approach. The current framework, published in the British Journal of Sports Medicine, is called PEACE & LOVE. In the immediate phase, the key steps are: protect the joint by avoiding movements that increase pain, elevate the leg, avoid anti-inflammatory medications in the first day or two (more on that below), compress with a bandage or sleeve, and educate yourself about what normal recovery looks like rather than catastrophizing.
After the first couple of days, the emphasis shifts to gradually reloading the joint. Light, pain-free movement is better than total rest. Optimism matters too: people who expect to recover tend to recover faster, while fear and anxiety about the injury can slow healing. The goal is controlled, progressive activity, not weeks on the couch.
A Note on Anti-Inflammatories
Reaching for ibuprofen or naproxen is a natural first instinct. These medications do help with pain, but there’s a catch. Inflammation in the first day or two is part of your body’s healing process, and suppressing it too early may interfere with tissue repair. If you do use naproxen for a joint issue, the typical dose is 500 to 1,000 milligrams per day, taken with food to protect your stomach. Use the lowest dose for the shortest time that controls your symptoms. People who are older or have heart, liver, or kidney issues should use lower doses.
Where It Hurts Can Tell You Why
Knee pain isn’t one condition. The location of your pain is one of the best clues to what’s causing it.
Front of the knee (around the kneecap): This is the most common spot, especially for people who recently increased their activity level. Runner’s knee (patellofemoral syndrome) is the classic culprit, caused by overuse or a sudden jump in training. Cartilage softening under the kneecap and kneecap tracking problems also cause pain here. If it hurts specifically when you kneel, that points toward bursitis of the tissue in front of the kneecap, sometimes called housemaid’s knee.
Inner (medial) side: Pain on the inside of the knee often relates to the medial collateral ligament (MCL), which stabilizes the joint against sideways forces, or a medial meniscus tear. If the pain is a few inches below the joint line, pes anserine bursitis is a common cause. Inner knee pain during stair climbing often signals an MCL strain or early arthritis.
Outer (lateral) side: Lateral knee pain in runners and cyclists is frequently iliotibial band syndrome, where a thick band of tissue on the outside of the thigh becomes irritated where it crosses the knee. Lateral meniscus tears also cause pain here.
Behind the knee: Posterior pain, especially when bending, may come from a Baker’s cyst (a fluid-filled pocket behind the joint) or a hamstring tendon problem.
Above the knee: Pain higher up usually involves tendon inflammation in the quadriceps or hamstrings, or it can be referred pain from arthritis within the joint itself.
Exercises That Reduce Knee Pain
Strengthening the muscles around your knee is one of the most effective things you can do for almost any type of knee pain. Weak quadriceps, hamstrings, and hip muscles leave the knee joint absorbing forces it isn’t designed to handle alone. A conditioning program from the American Academy of Orthopaedic Surgeons recommends the following exercises, done 4 to 5 days per week for building strength or 2 to 3 days per week for maintenance:
- Straight-leg raises: 3 sets of 10. Lie on your back, bend one knee, and lift the straight leg to the height of the bent knee.
- Half squats: 3 sets of 10. Stand with feet shoulder-width apart and lower yourself only halfway down.
- Hamstring curls: 3 sets of 10. Standing, slowly bend one knee to bring your heel toward your buttock.
- Leg extensions: 3 sets of 10. Seated, slowly straighten your knee against resistance or gravity.
- Hip abduction: 3 sets of 20. Lying on your side, lift the top leg straight up. This strengthens the outer hip, which helps stabilize the knee during walking and running.
Warm up with 5 to 10 minutes of walking or stationary cycling before starting. These exercises should be challenging but not painful. If any movement causes sharp pain in your knee, skip it and try again in a week.
When a Brace Can Help
Knee braces come in several types, and the right one depends on your problem. A simple compression sleeve is the most common starting point. Sleeves provide mild support and warmth, and they work well for general knee pain or mild instability. If you have osteoarthritis, an unloader brace is designed specifically to shift pressure away from the damaged part of the joint to a healthier area, reducing pain during walking and standing. For ligament injuries like an ACL or MCL tear, a functional brace limits excessive movement so the knee stays in a safe range during activity. Athletes in contact sports sometimes wear prophylactic braces to protect healthy ligaments from impact.
A brace is a tool, not a fix. It works best when combined with strengthening exercises rather than used as a substitute for them.
Surgery Is Rarely the First Option
If you’ve been told you have a meniscus tear, especially a degenerative one (the kind that develops gradually rather than from a single injury), surgery may not offer more benefit than physical therapy. A 2025 meta-analysis of six randomized controlled trials, covering over 1,100 patients, found no significant difference in knee function, activity level, or pain between people who had arthroscopic meniscus surgery and those who did physical therapy alone at the five-year mark. Even patients with mechanical symptoms like catching or locking saw similar outcomes.
More concerning, the surgical group had significantly higher rates of osteoarthritis progression over time. That doesn’t mean surgery is never appropriate, but it does mean a dedicated course of physical therapy is worth trying first for most degenerative tears. Surgery tends to be reserved for cases where the knee is truly locked or where months of rehab haven’t helped.
When Knee Pain Isn’t Getting Better
Most acute knee pain improves noticeably within two to four weeks of consistent home care. If yours hasn’t budged after that window, or if it’s getting worse instead of better, it’s time for a professional evaluation. A physical therapist can identify muscle imbalances and movement patterns that are contributing to the problem. Imaging like an X-ray or MRI may be useful if there’s concern about structural damage, but many providers will start with a physical exam and targeted rehab before ordering scans.
Chronic knee pain that has lingered for months responds best to a combination of strengthening, activity modification, and sometimes weight management, since every pound of body weight translates to roughly four pounds of force on the knee during walking. Even modest weight loss, if relevant, can produce noticeable relief.