Knee pain is one of the most common problems affecting people of different ages. You may notice pain when walking, bending your knee, climbing stairs, exercising or even resting at night.
If you are asking, “Why does my knee hurt?”, the answer can depend on where the pain is located, how long you have experienced it and whether you recently had an injury.
Knee pain can develop because of an injury, overuse, arthritis, inflammation or other health conditions. While mild knee pain may improve with rest and appropriate self-care, persistent or severe pain may need medical assessment.
In this guide, CareCraft MedSnow explains 10 common causes of knee pain, symptoms to watch for and when you should seek medical help.
Important: This article provides general health information and does not replace professional medical advice.
What Does Knee Pain Feel Like?
Knee pain can feel different depending on the underlying cause. Some people experience a dull ache, while others may feel sharp or sudden pain.
Common symptoms can include:
- Aching or throbbing pain
- Sharp pain when moving
- Stiffness
- Swelling
- Warmth around the knee
- Difficulty bending or straightening the leg
- Clicking or popping
- A feeling that the knee may give way
The location of your pain can also provide useful clues. For example, pain at the front, back, inside or outside of the knee may have different possible causes.
1. Knee Injury
A knee injury is one of the most common reasons for sudden knee pain.
Injuries may happen during:
- Sports
- Running
- Exercise
- Falls
- Twisting movements
- Accidents
Common knee injuries can involve ligaments, tendons, cartilage or other structures inside the joint.
Symptoms may include sudden pain, swelling, bruising and difficulty putting weight on the leg.
If you cannot put weight on your knee or believe you have suffered a serious injury, seek medical advice.
2. Osteoarthritis
Osteoarthritis is a common cause of knee pain, particularly as people get older.
It can affect the cartilage and other structures within the joint, leading to pain, stiffness and reduced movement.
Symptoms may include:
- Knee pain during movement
- Stiffness after resting
- Swelling
- Reduced flexibility
- Difficulty walking
Knee osteoarthritis symptoms can vary. Some people experience mild discomfort, while others may have persistent pain that affects daily activities.
3. Overuse and Repetitive Movement
Repeated stress on the knee can cause pain and irritation.
This may occur in people who:
- Run frequently
- Play sports
- Exercise intensely
- Kneel regularly at work
- Perform repetitive movements
Increasing your activity level too quickly can sometimes place extra strain on muscles, tendons and joints.
Pain may gradually develop and become worse with continued activity.
4. Patellofemoral Pain Syndrome
Patellofemoral pain syndrome is often associated with pain around or behind the kneecap.
Some people may experience pain when:
- Climbing stairs
- Squatting
- Running
- Sitting for long periods
- Bending the knee repeatedly
The pain may gradually develop rather than appearing suddenly.
If knee pain continues or affects your ability to exercise, consider speaking with a healthcare professional.
5. Tendon Problems
Tendons connect muscles to bones, and repeated stress can sometimes cause tendon pain.
Knee tendon problems may cause:
- Pain during movement
- Tenderness
- Stiffness
- Pain during exercise
- Swelling around the affected area
Pain may become worse during activities such as jumping, running or climbing stairs.
Rest and appropriate activity modification may help, but persistent tendon pain should be assessed.
6. Bursitis
Bursae are small fluid-filled sacs that help reduce friction around joints.
When a bursa becomes irritated or inflamed, it can cause a condition known as bursitis.
Symptoms may include:
- Swelling
- Tenderness
- Pain when moving
- Warmth around the knee
Repeated kneeling can contribute to certain types of knee bursitis.
7. Meniscus Problems
The meniscus is a piece of cartilage that helps cushion and stabilise the knee joint.
A meniscus injury may happen after twisting the knee, especially during sports or sudden movements.
Possible symptoms include:
- Knee pain
- Swelling
- Difficulty moving the knee
- Clicking or catching
- A feeling that the knee is locking
A healthcare professional can assess persistent symptoms and determine whether further examination is necessary.
8. Ligament Injuries
Ligaments help keep the knee stable.
Sudden twisting, impact or forceful movements can injure knee ligaments.
Common symptoms may include:
- Sudden pain
- Swelling
- Instability
- Difficulty walking
- A feeling that the knee may give way
Serious ligament injuries may require medical assessment.
9. Rheumatoid Arthritis and Other Inflammatory Conditions
Some types of arthritis involve inflammation caused by the immune system.
Rheumatoid arthritis can cause joint symptoms including:
- Pain
- Swelling
- Stiffness
- Warmth
Inflammatory arthritis may affect more than one joint and can sometimes cause symptoms elsewhere in the body.
Persistent joint swelling or morning stiffness should be discussed with a healthcare professional.
10. Pain Referred From Another Area
Sometimes, pain felt around the knee may be related to another part of the body.
For example, problems affecting the:
- Hip
- Lower back
- Nerves
may sometimes contribute to pain that is felt in or around the knee.
If your knee appears normal but the pain continues, a healthcare professional may consider other possible causes.
Why Does My Knee Hurt When Walking?
Knee pain when walking can occur for many reasons.
Common possibilities include:
- Osteoarthritis
- Overuse
- Tendon problems
- Previous injuries
- Muscle weakness
- Problems affecting the kneecap
The pain may become worse when walking uphill, downhill or for long distances.
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Why Does My Knee Hurt When I Bend It?
Pain when bending your knee may occur because of an injury, inflammation, stiffness or irritation affecting the joint.
Possible symptoms may include:
- Sharp pain
- Clicking
- Stiffness
- Swelling
- Difficulty squatting
If you cannot bend or straighten your knee normally, or your knee becomes locked, seek medical advice.
Why Does My Knee Hurt at Night?
Knee pain at night can make sleeping difficult.
Possible reasons include:
- Arthritis
- Inflammation
- Injury
- Certain sleeping positions
- Increased awareness of pain while resting
Persistent or worsening pain at night should be discussed with a healthcare professional.
What Can You Do for Mild Knee Pain?
The right treatment depends on the cause of the pain. However, mild knee discomfort may sometimes improve with appropriate self-care.
You may consider:
Resting From Activities That Worsen the Pain
Avoid activities that clearly make your symptoms worse, particularly high-impact exercise.
Gentle Movement
Complete rest is not always necessary. Gentle movement may help prevent stiffness.
Applying Ice
A cold pack wrapped in a cloth may help with pain and swelling following a recent minor injury.
Using Heat
Heat may help some people experiencing muscle stiffness or chronic discomfort.
Maintaining a Healthy Activity Level
Gradually strengthening muscles around the knee may support the joint, depending on the underlying cause.
Before starting a new exercise programme, seek advice if you have severe or persistent knee pain.
When Should You Seek Medical Help for Knee Pain?
You should consider seeking medical advice if your knee pain:
- Is severe
- Does not improve
- Keeps returning
- Affects walking or daily activities
- Causes significant swelling
- Makes it difficult to put weight on the leg
- Occurs after a significant injury
- Causes the knee to lock or give way
Seek urgent medical help if you have severe pain after a serious injury or develop a severely swollen, hot or red knee, particularly if you also feel unwell or have a fever.
Can Knee Pain Be Prevented?
Not all knee pain can be prevented, but some steps may help reduce the risk of certain injuries and overuse problems.
These include:
- Warming up before exercise
- Increasing activity gradually
- Using appropriate footwear
- Maintaining muscle strength
- Avoiding sudden increases in training intensity
- Taking breaks from repetitive activities
- Using correct exercise techniques
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Final Words
If you are wondering, “Why does my knee hurt?”, there are many possible explanations. Knee pain may result from injuries, overuse, arthritis, inflammation or problems affecting the muscles, tendons, ligaments or cartilage around the joint.
The location and type of pain can provide useful clues. Pain when walking, bending, climbing stairs or resting at night may each have different possible causes.
Mild knee pain may improve with appropriate rest, gentle movement and self-care. However, persistent, severe or worsening pain should be assessed by a qualified healthcare professional.
At CareCraft MedSnow, we aim to provide clear health information to help you better understand common symptoms and know when professional medical advice may be needed.
Frequently Asked Questions About Knee Pain
What is the most common cause of knee pain?
Common causes include injuries, osteoarthritis, overuse, tendon problems and conditions affecting the structures inside the knee.
Why does my knee hurt without an injury?
Knee pain can develop without a sudden injury. Possible causes include arthritis, overuse, inflammation and gradual wear and tear.
Is walking good for knee pain?
For some people, gentle walking may help maintain movement and reduce stiffness. However, if walking significantly worsens your pain, it is important to seek medical advice.
Why does my knee hurt when climbing stairs?
Pain when climbing stairs may be related to problems around the kneecap, arthritis, tendon problems or other conditions affecting the knee.
Why is my knee pain worse at night?
Night-time knee pain may be related to arthritis, inflammation, injury or sleeping position. Persistent or worsening night pain should be assessed by a healthcare professional.
Should I use heat or ice for knee pain?
Cold therapy may help reduce swelling after a recent injury, while heat may help relieve stiffness in some situations. The best approach depends on the cause of the pain.
Can being overweight cause knee pain?
Carrying additional body weight can place increased stress on the knee joints and may contribute to pain or worsen existing joint problems.
When should I worry about knee pain?
Seek medical advice if knee pain is severe, persistent, worsening, significantly swollen or affecting your ability to walk. Urgent assessment may be needed after serious injuries or when the knee is hot, red and swollen with fever or feeling unwell.
