The most common symptom of bone tumors is pain. In most cases, the symptoms become gradually more severe with time. Initially, the pain may only be present either at night or with activity. Depending on the growth of the tumor, those affected may have symptoms for weeks, months, or years before seeking medical advice. In some cases, a mass or lump may be felt either on the bone or in the tissues surrounding the bone. This is most common with MFH (malignant fibrous histiocytoma) or fibrosarcoma but can occur with other bone tumors. The bones can become weakened by the tumor and lead to a break in the bone or fracture after little or no trauma or just from standing on the affected bone. This can occur with both benign and malignant tumors. Even benign tumors can spread locally and weaken the surrounding bone. If the tumor compresses the surrounding nerve it can cause pain, numbness, or tingling in the extremities. If the surrounding blood vessels are compressed, it can affect the blood flow to the extremities. Fever, chills, night sweats, and weight loss can occur but are less common. These symptoms are more common after spread of the tumor to other tissues in the body. Less commonly, cancer involving bones may result in an imbalance of minerals in the bloodstream, and in particular an elevation of calcium. Symptoms of an elevated calcium (hypercalcemia) can include constipation, confusion, drowsiness, excessive urination, and dry mouth as indicative of dehydration.