Are there any conditions that can go undiagnosed?

Are there any mental health conditions that often go overlooked? Maybe even undiagnosed? I figure we all have mental conditions we don't even know about, maybe it lives dormant in us, or it doesn't affect us like some others. But are there any conditions that can go unchecked for years or even a lifetime? Like, are there some conditions we'll never know we even had?

Yeah, I think a lot of those conditions go unnoticed. I’ve met people who only found out they had ADHD as adults and it’s the same with anxiety, they just thought it was stress.