The main causes of weakness and cramps in cats’ hind legs are as follows: First, calcium deficiency. When a cat’s body is severely deficient in calcium, its hind legs will be weak and cramp from time to time. Second, poisoning. Toxicity can cause serious damage to cats’ nerves, often leaving sequelae of weakness and cramps in the hind legs. Third, injuries to the legs, such as collisions, jumping off buildings, etc., can cause the nerves in the back of the cat’s spine to be compressed, resulting in weakness or even cramps in the cat’s hind legs. Fourth, you are infected with internal parasites. The toxins released by the parasites can affect the nerves and cause leg cramps.

1. Calcium deficiency

A cat's diet with a single ingredient for a long time will lead to a lack of nutrition in the cat. When the body is severely deficient in calcium, the cat's hind legs will be weak or even cramped. Therefore, owners must pay attention to keeping the cat's nutrition balanced and supplement the cat with an appropriate amount of calcium and vitamins.

2. Poisoning

Poisoning can cause serious damage to cats’ nerves. Some cats will still have sequelae after treatment. Common ones are weakness and cramps in the hind legs. Therefore, owners must keep away items that are harmful to cats to prevent cats from accidentally eating them and causing poisoning.

3. Leg injuries

When a cat’s legs are injured, such as being hit, jumping off a building, etc., the pain will also cause the cat’s hind legs to become weak or even cramp. If this is the case, you need to take the cat to the pet hospital for examination and treatment as soon as possible, otherwise the cat may be at risk of fractures or paralysis.

4. Infection with internal parasites

If a cat is infected with internal parasites, the toxins released by the parasites will affect the cat's nerves, causing leg twitching. In this case, it is recommended that the owner perform internal deworming on the cat regularly. It is generally recommended to deworm the cat every three months.