One should feel lucky that there is someone over caring, rather than no one caring at all.
Too much affection and concern leads to over care. Usually this happens with parents and spouses. The one who takes care feels that the other is not able to take care by himself/herself.
Moreover over care happens hen the person who takes care has more knowledge about and also of the consequences of something. For example a child may be knowing that playing on dust and dirt makes its clothes dirty. But its mother is aware that unhygienic environment can cause infections and other diseases. So the mother becomes concerned and takes more care, which the child may feel irritated with as over care. A mother of a teenage daughter may feel much concerned about her daughter going out in the night especially in dark lanes and lonely roads. The mother may be warning a lot and dissuading and if permitted, giving many conditions and cautions. The daughter may feel it as over care.
It takes some real convincing with real proof action to make the over caring person understand that one can take care of himself. herself.
Over caring may be appearing as nuisance and interference, but if one can take things in stride, then it can really help and take our own burden away.