The simple answer to your question is a big, fat, emphatic NO. Lymph nodes are the area in the body where the immune system meets “the outside world”. Sometimes (though, infrequently) those immune cells go haywire, and you end up with cancer. Most often, a swollen lymph node is just a sign the immune system is responding to something (likely an infection of some sort, but perhaps some other type of allergen or irritant). So, the bottom line is that more often than not, swollen lymph nodes are benign (that is, not concerning). Many people have persistently small nodes in their neck, armpits or groin from multiple childhood infections (think all those scraped knees and elbows). If they change rapidly in size, or become more numberous, and don’t recede, then, it is time to see the doctor.
(Soapbox moment) All should realize that the internet is a wonderful place for getting information, but, it can be a scary place as well. All you see are the concerning or horror stories, but more often than not, your symptoms (whatever they may be, swollen lymph nodes, headache, bruising, etc.) are NOT CANCER, but rather, a transient event that will go away.