Knee Pain: 7 Causes, Symptoms, Treatment & Ortho Exercises
Knee pain is a common problem that can affect people of almost any age. It may start after an injury, develop gradually with age, or appear because of arthritis, overuse, muscle weakness, excess weight, or problems involving the ligaments, tendons, cartilage, or other structures around the knee. For some people, knee pain is only noticeable after a long walk or workout. For others, even simple activities such as getting out of a chair, climbing stairs, squatting, or walking can become uncomfortable. Persistent pain can also affect sleep, work, exercise, and overall quality of life. The important thing to remember is that knee pain is a symptom, not a diagnosis. The right treatment depends on what is causing the pain. In many cases, appropriate exercise, physiotherapy, lifestyle changes, and medicines prescribed by a doctor can help. Some injuries or advanced joint conditions may require more specialized treatment. This guide explains the common causes of knee pain, symptoms to watch for, treatment options, useful ortho exercises, and when you should see an orthopedic doctor. What Is Knee Pain? Knee pain refers to discomfort in or around the knee joint. The pain may occur at the front of the knee, behind the knee, on the inner or outer side, or around the kneecap. It can feel different from person to person. Some people describe it as a dull ache, while others experience sharp pain, burning, stiffness, or a feeling of pressure. Knee pain may occur: While walking While climbing or descending stairs When bending or straightening the knee After running or exercising After sitting for a long time When standing up from a chair At night or while resting After an injury or sudden twisting movement The duration can also vary. Acute knee pain may develop suddenly and last for a short period, while chronic knee pain can continue for weeks, months, or longer. If your pain is persistent or interfering with normal activities, identifying the underlying cause is important. What Causes Knee Pain? There are many possible causes of knee pain. Some are related to injuries, while others develop gradually because of wear and tear or changes in muscle strength and movement. Here are some of the most common causes. 1. Knee Arthritis Arthritis is a common cause of long-term knee pain, particularly among older adults. Osteoarthritis develops when the cartilage that helps protect the ends of bones within the joint gradually deteriorates. As the joint changes, movement may become uncomfortable and stiffness can increase. People with knee arthritis may experience: Pain after walking or standing Morning stiffness Difficulty climbing stairs Pain when getting up from a chair Reduced knee movement Swelling Grinding or clicking sensations The severity of symptoms varies. Some people have significant changes on imaging but relatively mild symptoms, while others may experience considerable pain and difficulty with everyday activities. Treatment is usually based on symptoms, examination findings, activity level, and the degree of joint damage. 2. Knee Injuries An injury can cause sudden knee pain. Sports, road accidents, falls, or simply twisting the knee awkwardly can damage one or more structures within the joint. Common knee injuries include: ACL injuries MCL injuries Meniscus tears Knee sprains Tendon injuries Patellar injuries Fractures around the knee A significant injury may be accompanied by swelling, difficulty putting weight on the leg, instability, or a popping sensation. If the pain started immediately after a major injury, it is better to get the knee examined rather than continuing normal activity and hoping it will settle on its own. 3. Meniscus Tear The menisci are two pieces of cartilage inside the knee that help distribute load and absorb shock. A sudden twisting movement can cause a meniscus tear. It can also develop gradually as the knee becomes more vulnerable with age. Symptoms can include: Pain when twisting the knee Swelling Clicking Catching or locking Difficulty bending or straightening the knee A feeling that something is moving inside the joint Not every meniscus tear requires surgery. Treatment depends on factors such as the patient’s age, symptoms, tear location, severity, activity level, and overall knee condition. 4. Ligament Injuries Ligaments connect bones and help keep the knee stable. The ACL, PCL, MCL, and LCL can all be injured. ACL injuries are particularly common in sports involving sudden stops, jumping, landing, or changes of direction. An ACL injury may cause: Sudden pain A popping sensation Rapid swelling Difficulty walking Reduced confidence in the knee A feeling that the knee may give way Some ligament injuries can improve with structured rehabilitation, while others may require surgery depending on the injury and the person’s functional requirements. 5. Muscle Weakness The muscles around the knee, hip, and thigh play an important role in supporting movement. When these muscles are weak, the knee may be exposed to greater stress during activities such as walking, running, squatting, or climbing stairs. This is one reason strengthening exercises are commonly included in orthopedic rehabilitation. However, the best ortho exercise depends on the underlying problem. Someone recovering from an ACL injury may require a very different exercise program from someone with knee arthritis. 6. Tendon Problems Tendons connect muscles to bones. Repeated stress can sometimes irritate the tendons around the knee. Patellar tendinopathy, for example, can cause pain below the kneecap and is commonly associated with activities involving repeated jumping or running. Symptoms may become more noticeable during: Jumping Running Squatting Climbing stairs Repeated bending of the knee Reducing excessive loading and following an appropriate rehabilitation program can help in many cases. 7. Patellofemoral Pain Patellofemoral pain refers to discomfort around or behind the kneecap. It may occur in people who participate in running, jumping, or other repetitive activities, but it can also affect people with reduced muscle strength or altered movement patterns. Common symptoms include pain during: Squats Stairs Running Jumping Prolonged sitting The treatment often focuses on activity modification, strengthening, flexibility, and correcting contributing movement factors. Knee Pain Symptoms You Should Not Ignore The symptoms associated with knee pain can provide important