Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Seek urgent or emergency help for:
Sudden severe bone pain, deformity, or inability to use a limb
New or rapidly worsening breathing difficulty
Chest pain, coughing up blood, fainting, or blue-grey lips
New leg weakness, numbness, or loss of bladder or bowel control
These symptoms do not always mean that osteosarcoma has worsened, but they require rapid assessment.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
If you are being treated for osteosarcoma, contact your cancer team promptly about new symptoms, treatment side effects, or difficulty controlling pain.
Fever during chemotherapy can indicate a serious infection and needs immediate advice from the treating cancer service, even if you otherwise feel well.
3
Does any of this apply?
Book an appointment
Arrange a medical assessment for bone pain that persists, worsens, repeatedly returns, occurs at night, or is accompanied by swelling, a lump, a limp, or reduced movement.
These symptoms commonly have non-cancerous causes, but they should not be ignored.
Every sign above is quoted from the sofidex article on Osteosarcoma. If you are not sure, err upward — it is always reasonable to be checked.