A cat's inability to stand up, limp body and meowing may be caused by a variety of reasons, including but not limited to hypoglycemia, injury, and certain diseases. Here are some possible causes and suggestions:

1. Hypoglycemia: Hypoglycemia may cause muscle weakness in cats , making it impossible to stand.

2. Injury: Cats may be injured during play or other activities, resulting in fractures or other injuries that prevent them from standing. 3. Disease: Certain diseases, such as feline distemper, may cause cats to be unable to stand.