Children & Infants
Baker's (Popliteal) Cyst in Children
A soft, fluid-filled lump behind the knee that is usually harmless in children and often goes away on its own.
Also known as: Popliteal cyst, Baker's cyst
📝 At a glance
Likely root causes: Minor irritation to the back of the knee (e.g., legs dangling off a chair too high for the feet to reach the floor); Associated joint irritation in children with juvenile rheumatoid arthritis (less common).
First thing to try: Watch and wait — most childhood popliteal cysts resolve on their own over months
See a doctor if: Rapid growth, redness, or significant pain
🔎 Start with the cause
Lasting relief rarely comes from covering a symptom. First find what is feeding the problem, change what you can, and then help the body do what it was designed to do — heal.
Likely root causes
- Minor irritation to the back of the knee (e.g., legs dangling off a chair too high for the feet to reach the floor)
- Associated joint irritation in children with juvenile rheumatoid arthritis (less common)
Change what you can
- Watch and wait — most childhood popliteal cysts resolve on their own over months
- Make sure chairs and seats allow the child's feet to reach the floor or a support to reduce repetitive strain behind the knee
- Note any pain, redness, or rapid growth and have it checked by a health care provider
🩺 When to see a doctor
- Rapid growth, redness, or significant pain
- Signs of associated joint disease (persistent swelling, stiffness, warmth in other joints)
🌿 The seven pathways to health
Seven pathways for your baker's (popliteal) cyst in children — tap the circle to check one off (saved on your device), or ask Remy for help.
“Disease is an effort of nature to free the system from conditions that result from a violation of the laws of health... In case of sickness 1cause should be ascertained, 2go to work intelligently to remove the disease. 3Unhealthful conditions should be changed, 4wrong habits corrected. 5Then nature is to be assisted in her effort 6to expel impurities and 7to re-establish right conditions in the system.”
🌿 Overview
A smooth lump behind the knee, ranging from pea- to golf-ball-sized, most often appears in six- and seven-year-olds after minor injury such as dangling the legs off a too-high chair. Most resolve without any treatment over months.
A Baker's or popliteal cyst is simply a pocket of joint fluid that has collected behind the knee. In children it is usually a benign, self-resolving finding rather than a sign of a serious problem, and studies following untreated cysts have found that most shrink and disappear within a couple of years. In a minority of children the cyst is linked to joint irritation from juvenile arthritis, so persistent swelling deserves a medical look.
Common signs
- Smooth, soft lump on the back of the knee
- Usually painless, occasionally tender
- Typically on one side
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🍽️ Eating to help
Food is one of the gentlest medicines — small, steady changes help most.
No dietary connection; this is a mechanical/joint-fluid issue.
⚖️ Good to know
- Recurrence after surgical removal is common in children, so many practitioners prefer to let it resolve on its own rather than operate
⚕️ What a doctor may offerConventional treatments for this condition — for your information.Show ▾
RemedyRank's heart is natural healing — and honest information. Here is what conventional medical care commonly involves for this condition, listed to inform, never to promote. Decisions about treatment belong with you and your own physician.
Doctors typically confirm the diagnosis with an exam or ultrasound and then simply monitor, since most childhood popliteal cysts go away without treatment.
Commonly offered
- Watchful waiting — most resolve within a couple of years–
- Ultrasound to confirm it's a simple fluid-filled cyst–
- Referral to a specialist only if it's unusually large, painful, or persistent–
Worth knowing
- See a doctor if the lump grows quickly, is painful, red, or limits knee movement, to rule out other causes.
👍/👎 shares whether a treatment helped you — community experience, not medical advice. For full professional details, see the sources under “Learn more” below.
📜 A note from history
Watchful waiting has long been favored for benign childhood popliteal cysts given their high rate of spontaneous resolution.
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