Pain behind the knee is often caused by a Baker's cyst, a hamstring strain or arthritis inside the joint. A Baker's cyst is a fluid-filled swelling at the back of the knee, usually linked to arthritis or a meniscus tear.
Urgent: if your calf is swollen, warm and tender, especially after a long flight or surgery, go to a doctor the same day. It can be a blood clot (DVT).
Common causes
| Cause | Clues |
|---|---|
| Baker's cyst | Tight swelling behind the knee, worse when fully bending or straightening |
| Hamstring strain | Started during sprinting or kicking |
| Arthritis or meniscus tear | Also pain inside the joint |
Relief
Treating the cause inside the knee usually settles a Baker's cyst. Ice, gentle exercise and gel help in the meantime.