Chronic pain that lingers without an obvious cause should be taken seriously. For example:

• Back pain can signal bone or ovarian cancer.

• Headaches that don’t respond to treatment may relate to brain tumors.

  12 Early Warning Signs Your Body May Be Developing Cancer Cells

  4. Unusual Lumps or Swellings

  A new lump under the skin, in the breast, neck, groin, or armpits can be one of the earliest symptoms of abnormal cell growth. Always have persistent lumps checked by a doctor.

  5. Skin Changes

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