FLUTTER Checkbox UI not updating

I have of many checkboxes as You can see the image uploaded, please see the image first.

Now the problem is that you can see the 3 cards views Conditions, Allergies and Past Surgeries. and all of these cards contains checkboxes and now what happens is that when I check or uncheck any box the UI of the CheckBox doesn't update to tick or untick and I have checkboxes outside the build method.

Can anyone let me know that what am I doing wrong and I will share the checkboxes codes also?

EDIT

CREATING CHECK BOXES DYNAMICALLY

List<Widget> _dynamicListWidget(List<dynamic> list) {

 List<Widget> widgetList = List<Widget>();
 for (var i = 0; i < list.length; i++) {
  Condition condition = list[i];
  widgetList.add(
    Container(
      width: _containerWidth,
      //padding: EdgeInsets.only(top: 2, bottom: 2),
      child: Row(
        children: <Widget>[
          Expanded(
              child: Container(
            margin: EdgeInsets.only(left: 10),
            child: Text(condition.name, style: _textStyle),
          )),
          //Expanded(child: Container()),
          Checkbox(
            value: condition.selected,
            onChanged: (bool value) {
              print("$value  value");
              setState(() {
                condition.selected = value;
              });
              addRemoveFavHealth(value, condition.id);
            },
          ),
        ],
      ),
    ),
  );
}
return widgetList;

}

CREATING A CARD VIEW

 Widget mainbody(String name, List<dynamic> dynamicList) {
final screenWidth = MediaQuery.of(context).size.width;
final screenheight = MediaQuery.of(context).size.height;
print("$screenWidth width of device");
List<Condition> list = List();

return Container(
  width: screenWidth * 0.49,
  child: Card(
    color: Colors.white,
    child: Column(
      children: <Widget>[
        Container(
          //width: 200,
          padding: EdgeInsets.symmetric(vertical: 8, horizontal: 8),
          decoration: BoxDecoration(
            color: Colors.black12,
          ),
          child: Row(
            children: <Widget>[
              ClipOval(
                child: Material(
                  color: Colors.white,
                  child: SizedBox(
                    width: 40,
                    height: 40,
                    child:
                        /*Image.asset(
                                        'assets/icons/doc_icon.png'),*/
                        Icon(
                      Icons.playlist_add_check,
                      color: AppTheme.primaryColor,
                    ),
                  ),
                ),
              ),
              Flexible(
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      Text(
                        _localization.localeString(name),
                        style: TextStyle(color: AppTheme.primaryColor),
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
        Container(
          child: Column(
            children: _dynamicListWidget(list),
          ),
        ),
      ],
    ),
  ),
);

}

BUILD METHOD

@override
Widget build(BuildContext context) {
  _localization = AppTranslations.of(context);

  return Expanded(
    child: SingleChildScrollView(
      child: Column(
        children: _mainList,
      ),
    ) 
  );
}

In the build method, _mainList is the list of the MAINBODY METHOD.