Nasopharyngeal cancer (NPC) can share several symptoms with the flu, especially in the early stages. Here are nine symptoms that may overlap:

1. Sore Throat: A common symptom in both flu and nasopharyngeal cancer.

2. Runny or Stuffy Nose: Nasal congestion or a runny nose is frequent in both conditions.

3. Cough: A persistent cough can occur in both flu and nasopharyngeal cancer.

4. Fatigue: Feeling tired and weak is common in both.

5. Headaches: Both conditions can cause headaches, especially if there is pressure in the sinuses.

6. Fever: Though fever is more common in the flu, it can also occur with nasopharyngeal cancer if there's an infection.

7. Ear Pain or Fullness: This can be a sign of nasopharyngeal cancer, as the nasopharynx is near the ear.

8. Difficulty Swallowing: In nasopharyngeal cancer, this may occur due to tumor growth, while flu symptoms typically cause temporary discomfort.

9. Hoarseness or Changes in Voice: This can happen with nasopharyngeal cancer due to tumor effects on the vocal cords, though it’s less common with the flu.

If symptoms persist or worsen, it's important to consult a doctor for a proper diagnosis.