General practice·General practice
Knee swelling
Informed by recognized medical guidance
Overview
Knee swelling (also called knee effusion or 'water on the knee') is a buildup of fluid inside or around the knee joint. This can make the knee look puffy, feel tight, and may limit how well you can bend or straighten it.
Key facts
- Knee swelling is common and can happen to anyone, but certain conditions make it more likely.
- Mild swelling often gets better with rest and home care, but persistent or painful swelling needs a doctor's check.
- Swelling can be caused by injury, overuse, or underlying conditions like arthritis or infection.
Yes, knee swelling is a very common reason people visit their doctor. It can occur at any age, from mild bumps to more serious issues.
Knee swelling can affect people of all ages. Younger people often get it from injuries or sports, older adults may get it from arthritis or wear and tear, and it can also happen after surgery or due to infection.