Osteosarcoma Signs and Symptoms
If you are experiencing unusual or persistent bone discomfort, learning about the symptoms of osteosarcoma can help bring you some clarity. While this type of bone cancer is most frequently diagnosed in young adults, it can develop at any stage of adulthood. Osteosarcoma is a relatively rare condition overall, but it remains the most common form of primary bone cancer. For adults, understanding how these early warning signs differ from routine exercise injuries, deep muscle strains, or joint conditions is an important step in getting a timely and accurate evaluation.
Quick Facts: Osteosarcoma Signs & Symptoms
- Persistent bone pain: The most frequent symptom is a deep, aching pain in a bone that does not go away. While this discomfort might come and go in the earliest stages, it eventually becomes constant and often intensifies at night or during physical activity.
- Swelling and lumps: Over time, a noticeable lump, tenderness, or localized swelling can develop near the affected area. In adults, these tumors most commonly form in the long bones of the arms and legs, particularly around the knee or the upper arm near the shoulder.
- Reduced joint mobility: If a tumor develops close to a major joint, it can cause persistent stiffness and limit your normal range of motion, sometimes resulting in an unexplained limp.
- Unexplained bone fractures: Because the tumor gradually weakens the healthy bone structure from the inside out, the affected bone can fracture or break suddenly after a very minor injury or during routine, day-to-day movements.
Early Warning Signs of Osteosarcoma
In its earliest stages, osteosarcoma can quietly destroy healthy bone tissue from the inside out before causing any obvious external changes. Because this condition is rare in older adults, the initial warning signs are incredibly easy to overlook or misattribute to everyday occurrences. For instance, an adult might assume a slight, localized ache is just a minor sports injury, a lingering muscle strain from yard work, or the early onset of arthritis. Recognizing that a true warning sign is completely independent of physical trauma or overexertion is key to catching the condition early.
What does osteosarcoma feel like?
Many adult patients describe osteosarcoma discomfort as a deep, dull ache that feels like it is coming from the center of the bone rather than the surrounding muscle or joint. This pain has a tendency to intensify significantly at night while you are resting in bed, or during periods of normal physical activity when the bone bears weight. Depending on the exact size and location of the tumor, this deep ache might be accompanied by a noticeable sensation of localized warmth, a tender spot that hurts when pressed, or a firm lump that you can actually feel beneath the skin.
What does osteosarcoma look like?
Because osteosarcoma is an internal bone cancer, it does not have a distinctive external appearance. However, some patients notice swelling, redness or a lump near the affected bone. Additionally, reduced joint mobility may be observed.
Diagnostic images, such as X-rays or magnetic resonance imaging (MRI) scans, are usually necessary for a physician to visualize the internal bone structure and perform a detailed assessment. In particular, a noticeable change in the shape or structure of the femur or humerus could be a sign of osteosarcoma.
Symptoms of Advanced Osteosarcoma
As osteosarcoma progresses, its symptoms usually become more pronounced. In addition, some patients experience:
- Overwhelming fatigue
- Unintended weight loss
- Fever
- A low red blood cell count (anemia)
- Difficulty walking (if a leg bone is affected)
- Unexplained bone fractures
- Loss of bladder or bowel control (if a pelvic bone is affected)
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Frequently Asked Questions (FAQs) about Osteosarcoma Signs and Symptoms
The following FAQs-related article provides additional information about osteosarcoma signs and symptoms:
Benefit from World-Class Care at Moffitt Cancer Center
Moffit is proud to be a high-volume cancer center. As a result, the multispecialty team in our Sarcoma Program has acquired unrivaled expertise in diagnosing and treating all types of bone cancer, including osteosarcoma and other relatively rare conditions. We offer the latest diagnostic and treatment options as well as a robust portfolio of clinical trials.
Medically reviewed by Alexander Lazarides, MD, surgeon, Sarcoma Program.
If you would like to discuss your osteosarcoma symptoms with a specialist in our Sarcoma Program, you can request an appointment by calling 1-888-663-3488 or submitting a new patient registration form online. We do not require referrals.