If a cat is constantly lying down and feeling weak, it may be due to malnutrition. It needs nutritious food, such as supplements or nutritional pastes. The same symptoms can also occur when a cat has a cold; keep it warm and give it cold medicine. A cat's weakness and prolonged lying down could also be due to anemia, requiring a veterinary check-up and appropriate treatment.

If you find that your cat is weak all over and lies still, it means that the cat may be malnourished. At this time, the owner needs to feed the cat some nutritious food, and can also give the cat nutritional paste or health products.
When a cat catches a cold, it can feel weak all over, unable to stand and lying down. It may also experience sneezing, runny nose, and other symptoms. In this case, the owner should keep the cat warm and give it cold medicine to relieve its discomfort.
Anemia can also cause weakness in cats, but the owner needs to take the cat to the vet for an examination to determine whether it's nutritional anemia or anemia caused by parasites. Once the cause of the cat's illness is diagnosed, appropriate treatment measures can be taken to address the condition.