How to query database using variable and get all results not just one row

Hello I am trying to query a database to show records only for the current user using variable I get the correct data but only 1 row with results any guidance?

// Query database to retrieve records associated with the user
$sql = "SELECT * FROM table_name WHERE variable_name = :variable_name";
$stmt = $conn->prepare($sql);
$stmt->bindParam(':variable_name', $variable_name, PDO::PARAM_STR);
$stmt->execute();
$records = $stmt->fetchAll(PDO::FETCH_ASSOC);