A Baker’s cyst is a fluid-filled swelling that develops at the back of the knee. It may be a feature of disorders such as osteoarthritis and rheumatoid arthritis and it may also be caused by a knee injury. Most cysts are painless. Occasionally a cyst may rupture, causing pain in the calf.
In many cases, the cyst disappears by itself.
A large or painful cyst may be treated with pain relievers and corticosteroids to reduce inflammation. Rarely, a cyst may need to be drained or surgically removed

Othere related diseases

METATARSALGIA
Pain in the ball of the foot—metatarsalgia— is commonly due to excessive pressure on the ball of the foot from high-impact sports, poorly fitting footwear, ...

MUSCLE CRAMPS
Sudden muscle spasms in which a muscle or group of muscles becomes hard, painful, and tight often occur during physical exercise. Another common cause is sittin...

MUSCLE STRAINS AND TEARS
Muscle injuries range from a mild strain (sometimes referred to as pulling a muscle), in which the muscle fibers are overstretched, to a complete tear.
Str...

MYASTHENIA GRAVIS
In myasthenia gravis, the immune system attacks the receptors in muscles that receive nerve signals, resulting in muscle weakness.
The condition is sometim...

NERVOUS DISORDERS