Tip- Start by walking the basement and looking at the walls from ceiling intersect down to the floor intersect. On unfinished walls look for water stains, discoloration, paint bubbling, and deterioration mainly around cracks, mortar lines, in corners, under windows, and wall sections below outside grade. On finished walls look for water stains, discoloration, paint bubbling, trim pulling away from wall, wall covering swelling or peeling, and deterioration which are commonly found in corners, under windows, and wall sections below outside grade. You will want to move items away from the wall to make sure they are not hiding any signs of moisture or damage. Typical causes for these issues are unsealed cracks, backed up gutters, poorly designed gutter system, downspouts or sump pump discharge line not extended far enough away from the foundation, sump pump failure, grading issues, poor yard drainage, uncovered or below grade window wells, missing or clogged window well drains, house covering defects, and plumbing issues. Any issue found should be corrected immediately by an insured and licensed or certified professional to help prevent additional damage. A mold inspection would also be recommended after causes are corrected. A properly sized dehumidifier should be used to help remove moisture in the basement area.