Recently, my aunt had some minor health issues, and they found a "spot" on one of her lungs. One of her daughters suggested she go to Mayo Clinic in Phoenix, and there she was diagnosed with lung, liver, and lymph cancer. How can you have all of this with no symptoms?
Our organs have a lot of "spare capacity". So unless a significant part of the organ is destroyed by cancer, there may not be any obvious symptoms.
Another way in which cancer comes to notice is when it causes local pressure effects, like when pancreatic cancer blocks the bile duct.
Other symptoms of cancer include lump (as in breast cancer, lymphoma), bleeding (leukemia, cervical cancer) etc.
If pressure effects or significant organ damage has not occurred, as in your aunts case, there may not be any specific symptoms.
It is not uncommon for lung cancer to spread to mediastinal lymph nodes and the liver, yet have no specific symptoms.
All the best, and God Bless!
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