Adult Soft Tissue Sarcoma: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Adult Soft Tissue Sarcoma?
An oncologist, a doctor who specializes in cancer care, usually leads treatment, often with a surgeon trained in removing sarcomas. Because these cancers are rare, treatment at a center with experience in sarcoma is often recommended. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Adult soft tissue sarcoma is a rare cancer that starts in soft tissues such as muscle, fat, blood vessels, nerves, and tendons. It can appear almost anywhere but most often forms in the arms, legs, or belly.
Symptoms
The most common sign is a lump that keeps growing. It usually does not hurt at first, though it can cause pain if it presses on nerves or muscles. A sarcoma in the belly can cause belly pain, a feeling of fullness, or blood in the stool.
Causes and who gets it
Doctors do not know what causes most soft tissue sarcomas. Gene changes inside cells make them grow out of control. Inherited conditions such as Li-Fraumeni syndrome or neurofibromatosis raise the risk, as does past radiation treatment for another cancer.
How doctors diagnose it
A doctor will examine the lump and often order an imaging test such as an MRI. If the results look concerning, the doctor will order a biopsy, taking a small piece of the lump for a specialist to examine. This is the only way to know for sure if a lump is a sarcoma.
Treatment
Treatment depends on the tumor's size, location, and whether it has spread. Surgery is the most common treatment. Some people also get radiation therapy, which uses high-energy beams to kill cancer cells. Chemotherapy is used for some types or for cancer that has spread.
When to see a doctor
See a doctor if you have a lump that is growing, larger than about two inches, or painful, or for belly pain that does not go away or blood in the stool. These signs often turn out to be something less serious, but it is worth getting checked.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Either can examine a lump, order imaging, and refer you to a sarcoma specialist if needed.
Common questions
Is a soft tissue lump always cancer?
No. Most lumps are benign, which means they are not cancer. Things like lipomas, which are lumps made of fat, are very common and harmless. Only a biopsy can rule out sarcoma for sure.
Does adult soft tissue sarcoma run in families?
Most cases happen in people with no family history. A small number are linked to inherited conditions that pass from parent to child. If sarcoma runs in your family, ask a doctor whether genetic testing makes sense.
Can soft tissue sarcoma come back after treatment?
It can, which is why regular follow-up visits matter. Doctors use exams and imaging tests to watch for return of the cancer. The chance of it coming back depends on the type and stage.
Is adult soft tissue sarcoma the same as childhood sarcoma?
No. Children and adults get different types of sarcoma. The treatment plans and outlooks can differ, so specialists treat each group separately.
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Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
