So worried that it's throat or mouth cancer. what are symptoms of throat or mouth cancer?

Many: There are many symptoms, if you are worried you should make an appointment with an oral surgeon so you can be properly diagnosed. Only a face-to-face appointment with a doctor can tell you for sure if your symptoms are evident of cancer.

None: Until the cancer becomes late stage, there are very few if any symptoms of oral cancer. Most cancers are found first by a dentist upon routine examination by the visual changes of the tissue. Newer fluorescent technologies have come out to find oral cancer earlier, ask your dentist about them. Velscope and vizilite are two examples. If the tissue looks abnormal, a biopsy is the only diagnostic.

Signs/Symptoms: See oral surgeon or ENT doc if you have any of these symptoms: Persistent mouth sore, persistent mouth pain, a lump or thickening in the cheek, a white/red patch on the gums, tongue, tonsil, or lining of the mouth, a sore throat, hoarseness or feeling that something is caught in the throat that does not go away, difficulty swallowing/chewing.