An ache in the bones can be easily explained away, especially when you’re physically active, growing, or recovering from an injury. However, persistent bone pain and swelling around the affected area can be early symptoms of osteosarcoma, particularly if they occur around the knee, upper arm, or shoulder.1 The pain may become more noticeable with activity, or (sometimes) worsen at night.

That doesn’t mean every lingering pain is a sign of cancer. Specifically in children and teenagers, sports injuries and normal growing pains are much more common causes. But regardless of age, persistent symptoms without a clear cause warrant evaluation.

If you’re exploring your options, you can also learn more about ITC’s holistic treatment for bone cancer.

What Are the Most Common Osteosarcoma Symptoms?

For people suffering from osteosarcoma, pain is the most common complaint, but swelling, a noticeable mass, difficulty moving the affected limb, and, in some cases, a fracture can also occur. These changes can develop gradually, so noticing patterns over time may be more informative than any symptom on its own.

The American Cancer Society lists several risk factors that can increase the risk of osteosarcoma, including inherited conditions like retinoblastoma and Li-Fraumeni syndrome, as well as previous exposure to radiation, such as radiation treatment received for another cancer.

Most people who develop osteosarcoma do not have any known risk factors, and having one doesn’t mean a person will develop this type of cancer, which is part of why the osteosarcoma causes and risk factors remain an active area of research, even as scientists work to understand why some people develop the disease and others with the same risk factors don’t.

Bone Pain

Bone pain is one of the most common signs of osteosarcoma. It can begin as an occasional ache that becomes more frequent or intense over time. Some people notice greater discomfort during physical activity, while others find the pain more noticeable at night or that it continues even at rest.

The location is also important: osteosarcoma commonly develops near the ends of long bones, particularly around the knee, although it can occur elsewhere, too.

Swelling or a Noticeable Lump

Osteosarcoma may also cause swelling that looks different from person to person. It may be subtle at first and more noticeable over time, and some people develop a firm lump beneath the skin near the affected bone.

Swelling can appear alongside pain, but the two don’t always develop at the same time. Its location and extent can also vary depending on where the tumor develops and how it affects the tissue around. If you’re trying to picture what these changes can look like, our guide on what bone cancer looks like includes examples of common signs.

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Limping or Reduced Movement

As a natural consequence of pain and swelling, your movement may be affected. A child may begin limping, avoid putting weight on one leg, or stop using one arm normally because of the discomfort in the affected arm or leg. Adults may notice stiffness or difficulty moving the affected joint.

Notably, these changes aren’t specific to osteosarcoma. Joint injuries, arthritis, and other bone or muscle conditions can cause similar problems.

Unexplained Bone Fracture

In 5 to 10% of cases, osteosarcoma can weaken a bone enough to cause a pathologic fracture, meaning it breaks after little or no significant trauma. As the tumor changes the bone’s normal structure, the affected area may not be able to handle everyday stress as well as it normally would.

Sometimes, the fracture is what leads doctors to discover an underlying bone abnormality. Imaging can reveal bone changes that may have contributed to the break.

Still, osteosarcoma isn’t the only possible explanation, since benign tumors, infections, osteoporosis, and other bone conditions can also weaken the bone. Doctors must consider the fracture alongside the person’s symptoms and medical history, along with imaging findings, to determine whether the tumor is cancerous.

Signs of Osteosarcoma in Children vs. Adults

While osteosarcoma is most often diagnosed in youth (5.4 cases per million under age 19), there are still an estimated four cases per million in individuals under 40,2 and some research suggests another peak between 60 and 69. Although symptoms can occur across age groups, how they’re interpreted may differ depending on a person’s age and other more likely explanations.

Osteosarcoma and Ewing sarcoma are the two most common sarcomas of bone affecting children and teens, and while their early symptoms can look similar, the Ewing sarcoma survival rate and outlook differ enough from osteosarcoma’s that getting the right diagnosis matters.

In a growing child or teenager, persistent bone pain may initially be blamed on growing pains, sports, or an everyday injury. In fairness, these explanations are much more common than osteosarcoma. However, you’re right to be concerned if long-term bone pain has no clear explanation, regardless of age.

Osteosarcoma Symptoms in Adults

Osteosarcoma symptoms in adults can include the same core changes of bone pain, swelling, and limping as those in adolescents.

However, they’re sometimes mistaken for arthritis, overuse injuries, or ordinary joint pain that comes with aging, particularly when the tumor develops close to a joint.

Where Osteosarcoma Symptoms Most Often Appear

As discussed before, osteosarcoma can develop in any bone, but it tends to concentrate in the long bones of the legs, particularly near the knee. The upper arm and hip are also common locations.

Researchers don’t have a specific answer for why this happens. One possible explanation has to do with how quickly bones grow and change, particularly during adolescence. The ends of long bones are especially active during growth, with bone-forming cells constantly building and remodeling bone. This is theorized to create more opportunities for the cellular changes that lead to tumor growth.3

However, rapid bone growth isn’t considered a direct cause of osteosarcoma, since most people go through growth spurts without developing the disease. At best, it’s a working explanation for why the disease tends to cluster in the fastest-growing parts of the skeleton.

Osteosarcoma Symptoms vs. Growing Pains or Sports Injuries

Since growing pains and sports injuries are far more common than osteosarcoma, it presents a difficult distinction to make on symptoms alone. The parents of a pre-teen who plays sports and develops pain around the knee, for example, have plenty of ordinary explanations to consider first. To name just a few:

  • The child may have overdone it at soccer practice, during gym class, or on the playground at recess, resulting in ordinary bumps and bruises
  • They’re going through developmentally normal growing pains due to growth spurts
  • They may have slept in an awkward position or sat with their legs crossed for too long

Aches and pains are normal, and even more so while their bodies are still growing. The key difference is what happens next. Growing pains and minor injuries are usually short-lived and improve as the child rests and recovers. Pain that continues beyond the expected recovery period, repeatedly returns, or becomes progressively worse deserves a closer look.

Swelling provides another useful distinction. An acute event like a sprain or tear will typically swell in the immediate aftermath, but unexplained swelling that persists or becomes more noticeable over time can’t be explained away by an old injury. In a recent systematic review of pediatric bone tumors, 48% of children with osteosarcoma had swelling at presentation.

The Role of Night Pain

Night pain is often mentioned when people discuss adolescent osteosarcoma, but it’s considered a low-sensitivity indicator, meaning many patients don’t present with it at all. One study, published in Pediatric Emergency Care, found that only about a third of pediatric patients with bone sarcomas reported night pain.4 A lack of night pain certainly doesn’t rule out the diagnosis, and its presence can be a “red flag” requiring evaluation.

What’s most important to understand is that persistent, unexplained pain of any kind is worth taking seriously.

The Role of Trauma

A child may first notice pain after a fall, sports game, workout, or other activity, leading those around them to assume the injury caused the problem.

In some cases, however, the injury simply draws attention to an issue that was already present. Here, recent research also found that a history of trauma was reported in a subset of pediatric osteosarcoma cases.5

When Should You See a Doctor?

You don’t need to assume the worst every time a bone hurts. Most aches in children, teenagers, and active adults have much more ordinary explanations. What matters is whether the problem behaves like a routine injury or continues on without a clear explanation.

Consider seeking medical evaluation when you notice:

  • Bone pain that persists for several weeks or keeps returning in the same location, despite rest or recovery from an injury
  • Unexplained swelling around a bone or joint
  • A firm or noticeable lump that wasn’t there before
  • Increasing difficulty using an arm or leg normally
  • A limp that doesn’t resolve
  • A fracture that occurs after relatively minor trauma

Questions to Ask About Osteosarcoma Symptoms

If you’re concerned about a persistent change, you don’t need to arrive with a diagnosis in mind. Start with questions that help clarify what could be happening:

  • “Could this be growing pains, a sports injury, or another condition that commonly causes this type of pain?”
  • “If the pain or swelling doesn’t improve, would imaging help determine what’s causing it?”
  • “What changes should I track over time, such as worsening pain, swelling, a lump, or difficulty moving the affected area?”
  • “Does the location, duration, or persistence of the pain make certain causes more likely?”
  • “At what point would you want to reassess these symptoms if they continue?”

If osteosarcoma isn’t caught early, the disease that has spread beyond the original bone becomes harder to treat, and cancer spreads most often to the lungs, though metastatic osteosarcoma can also involve other bones. This is part of why the osteosarcoma survival rate and life expectancy tend to look more favorable the sooner it’s caught, which is exactly why persistent symptoms are worth checking early, especially with metastatic disease factoring so heavily into the outlook.

Find Holistic Osteosarcoma Support at ITC

Persistent pain can leave you with more questions than answers. If you’ve moved from wondering whether an ache is ordinary to being diagnosed with osteosarcoma, you may be ready to look at your care from a different angle.

At Immunity Therapy Center, we provide alternative cancer treatments for people exploring options beyond conventional care. Our approach gives you the opportunity to discuss your diagnosis, previous care, and priorities with a team that can help you determine whether ITC is the right fit for your next step.

Don’t let uncertainty make the next decision for you. Schedule a consultation with our Tijuana cancer center to discuss your situation. You can also start by learning more about how long you can live with bone cancer for a broader look at outlook and next steps.

 

Sources: 

  1. British Journal of Cancer. UK guidelines for the management of bone sarcomas. https://www.nature.com/articles/s41416-024-02868-4
  2. National Cancer Institute. Osteosarcoma and Undifferentiated Pleomorphic Sarcoma of Bone Treatment (PDQ®)–Health Professional Version. https://www.cancer.gov/types/bone/hp/osteosarcoma-treatment-pdq
  3. PubMed Central. Osteoclasts in Osteosarcoma: Mechanisms, Interactions, and Therapeutic Prospects. https://pmc.ncbi.nlm.nih.gov/articles/PMC10661907/
  4. PubMed Central. Assessment of the Interval to Diagnosis in Pediatric Bone Sarcoma. https://pubmed.ncbi.nlm.nih.gov/37567167/
  5. PubMed Central. Clinical presentation of bone tumours in children and young people: a systematic review and meta-analysis. https://pmc.ncbi.nlm.nih.gov/articles/PMC12320600/

 

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