Knowledge: The symptoms of cancer are pain from certain body parts, low appetite and tired. On the other hand, chronic fatigue syndrome will show as constantly wanting to sleep, cannot eat much and does not want to go outside due to lack of energy.

Conversation:
I think I might have chronic fatigue syndrome because I'm so tired all the time.
Do you have long-term fatigue and other symptoms that limit a person's ability to carry out ordinary daily activities?
Hmm I am not sure. What kind of symptoms does chronic fatigue syndrome have?

Response: Yeah, the symptoms are constantly wanting to sleep, cannot eat much and does not want to go outside due to lack of energy.