You checked? For a single adult? Most states don't even cove Medicaid for a single adult with no kids, regardless of income. And for those that do, I'd be surprised if $18,000 qualifies him in most of them.

> If you won't get insurance, apply for financial aid in the healthcare system you use

Healthcare system he uses? You realize he's in the US, right? What healthcare system are you referring to?

I'd recommend that the poster go to the ER and tell them his symptoms. I'd say they'll almost certainly do tests on you. Ask to talk with a social worker if needed, and ask them about payment plans, and then if you can't pay, don't worry about it. With you income, it's highly likely they'll be willing to write most of the cost off. It's our fucked up system that's left necessary medical care unaffordable to you. If you were in a reasonable country, either:

a) there would be universal health care or single-payer insurance and you'd not have to worry about paying, or

b) care would be much, much more affordable and you could afford it. In Mexico, a colonoscopy would be a few hundred dollars, and a fecal occult blood test maybe 20-30 dollars.

Because of the corruption of our political officials, and the greed of our insurance companies, pharma companies, hospitals, and doctors, you're left without the recourse that 90% of the world has. So go to the ER and get it taken care of. Even if you have cancer (and it doesn't necessarily mean you do), you won't always end up with a colostomy bag. But the longer you wait, the more likely that becomes.