Final answer:
An ulcer with flat edges is a late sign associated with oral cancer. Early signs may not cause immediate pain but can manifest as unusual lumps, thickening of tissue, or changes in moles or warts. The CAUTION mnemonic helps remember these early signs.
Step-by-step explanation:
The question asks which of the following is a late sign associated with oral cancer: Warmth, Odor, Pain, or Ulcer with flat edges. Recognizing the warning signs of cancer can be pivotal for early diagnosis and treatment. Ulceration, especially an ulcer with flat edges, is a late sign of oral cancer. The usual early warning signs of cancer include unusual lumps or swelling, thickening of tissue that can be felt through the skin, and obvious changes in the size, shape, or color of a mole or wart.
One mnemonic that is useful to remember the warning signs is CAUTION, which stands for changes in bowel or bladder habits, a sore that does not heal, unusual bleeding or discharge, thickening or lump in the breast or elsewhere, indigestion or difficulty swallowing, obvious change in a wart or mole, and nagging cough or hoarseness.