Second to not smoking is getting checked at the first sign of anything suspicious. A lot (tens of percents) of people wait months or years.
It’s just that everything can be cancer and nothing. Some cancers have obvious symptoms others not so much. Any unexplained and rapid weight loss seems to be the most obvious. I don’t want to look up all the symptoms. Everything from gastric issues, back pains to moles and warts can be due to cancer.
- Sudden weight loss (>10-15 pounds without a change in exercise or diet)
- Any kind of recurring pain, especially headaches
- Your poop is messed up
- Blood anywhere - coughing up blood, nosebleeds when you don't usually have them, blood in your poop or urine
- Mood or behavior changes (helpful if you have someone close to you who may notice this)
- Feeling fatigued even when well-rested
- Swelling or lumps anywhere
- Trouble sleeping
Which is a lot of stuff, but fortunately can be summed up as "If you feel consistently worse than you usually do, go see a doctor".
The key is to make your judgement of "I am indeed feeling consistently worse" within a couple of weeks, not a few months or even years while hoping it'll get better on its own. It's harder than it sounds - life is always busy and it's easy to tell yourself that your discomfort is mild and you can hold out a little longer. I waited too long to act on some bad heartburn and my few months of delay were rewarded with permanent damage to my lower esophagus...
- New moles.
- Moles that increases in size.
- An outline of a mole that becomes notched.
- A spot that changes colour from brown to black or is varied.
- A spot that becomes raised or develops a lump within it.
- The surface of a mole becoming rough, scaly or ulcerated.
- Moles that itch or tingle.
- Moles that bleed or weep.
- Spots that look different from the others.
Info directly from here: https://www.cancer.org.au/cancer-information/causes-and-prev...