Can you have cancer without a noticeable tumor?

My body has been feeling different as i have a swollen lymph node under my left armpit about a jelly bean size for about 6 months. With that I also have been feeling weaker and have nausea from time to time. Also i get stomach pains sometimes. My doctor tells me not to stress it as i am 21 and blames it on anxiety... show more My body has been feeling different as i have a swollen lymph node under my left armpit about a jelly bean size for about 6 months. With that I also have been feeling weaker and have nausea from time to time. Also i get stomach pains sometimes.

My doctor tells me not to stress it as i am 21 and blames it on anxiety that I didn’t even know I had. He doesn’t even advise me to get tested for cancer.

Also, how small does a “tumor” have to be?
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