You are correct in being cautious.....pay attention to your "gut feeling" and do not ignore red flags. The right thing for all sellers to do is disclose, disclose, disclose....but this isn't always the path that is followed.
As a buyer, if you have concern, consider having your agent include an addendum that specifically addresses the issue and allows you to cancel you purchase offer with no penalty to you.
Buyers should always take advantage of their opportunity for a home inspection. This will also help to protect you best interests with regards to issues of concern.